Designing and deploying UC networks with Cisco Unified Session Management Edition

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2 Designing and deploying UC networks with Cisco Unified Session Management Edition Tony Mulchrone Technical Marketing Engineer Cisco Collaboration Technology Group

3 Housekeeping We value your feedback- don't forget to complete your online session evaluations after each session & the Overall Conference Evaluation Visit the World of Solutions and Meet the Engineer Visit the Cisco Store to purchase your recommended readings Please switch off your mobile phones After the event don t forget to visit Cisco Live Virtual: Use the Question Manager App to ask questions during this session: 3

4 What is this session about? Not just Session Management Edition, many of the topics here apply equally to multi-cluster, multi-trunk deployments SIP Trunking is the preferred Trunk protocol and shall be the focus of the design discussion in this session The reasons for recommending the deployment of SIP trunks only will be explained in this breakout session 4

5 Agenda Session Management Edition basics Trunk features that simplify SME designs Reasons for using SIP Trunks SIP Trunk feature recommendations SME SIP Trunk feature recommendations SME CoW+ SME Deployments Dial Plan SME Deployments Call admission Control SME Deployments ILS and URI routing SME cluster sizing 5

6 What is a Session Management Edition Cluster? CUBE CUBE CUBE H323 Trunk MGCP Trunk SIP Trunk A CUCM cluster and SME cluster use exactly the same software A CUCM cluster is typically used to register 10,000s of Phones (up to 80,000 supported) An SME cluster typically has 10s or 100s of Trunks (up to 2100 supported) An SME cluster is typically used as a platform for Trunk and Dial Plan aggregation Both CUCM and SME support Voice, Video and Encrypted calls Since the introduction of SME with UC 7.1 many new features have been developed that enhance SME and SIP trunk functionality 6

7 Why deploy Session Management Edition? Voic System CUBE PSTN CUBE Conferencing System H323 MGCP SIP Cisco Unified Session Management Edition Cluster CUCM Clusters with H323 QSIG Trunks to SME PBXs/ CUCM Clusters with SIP Trunks to SME CUCM Clusters with H323 Trunks to SME PBXs with MGCP QSIG Trunks to SME PBXs with MGCP Q931 Gateway Trunks CUCM/PBX with SIP QSIG Trunks to SME Leaf Unified CM Clusters/ Leaf UC Systems An SME cluster can interconnect 1000 s of UC systems using SIP, H323, or MGCP Trunks. SME allows you to reduce UC system complexity by centralizing your dial plan and call routing rules in the SME cluster which in turn allows you to simplify the dial plan and management of the connected UC systems 7

8 Changes in SME Deployments since UC 7.1 The growth in SIP Trunk only deployments. Voic System CUBE PSTN CUBE Conferencing System SIP Cisco Unified Session Management Edition Cluster CUCM Clusters with SIP Trunks CUCM Clusters with SIP Trunks IP PBXs with SIP Trunks PBXs with SIP Gateway Trunks Using SIP Trunks only greatly simplifies SME Trunk design and offers unique features and deployment options that cannot be taken advantage of with mixed protocol designs Mixed SIP/H323/MGCP Trunk deployments will continue to be supported 8

9 SIP and H323 Trunk features that simplify SME designs Run On All Unified CM Nodes Up to 16 Destination IP addresses These features : o Reduce the number of configured SIP Trunks and H323 ICTs o Simplify call distribution o Simplify call routing through Leaf and SME clusters by taking advantage of the Route Local rule.. SIP/H323 ICT Trunk SIP Trunk A CUB E SIP/H323 ICT Trunk SIP Trunk A CUB E CUB E SIP Trunk B CUB E CUCM SME CUCM SME 9

10 SIP and H323 Trunk features that simplify SME designs The Route Local Rule Outbound SIP Trunks, H323 Inter Cluster Trunks and Route Lists can take advantage of the Route Local Rule by using the Run On All Unified CM Nodes feature The Route Local Rule If the CUCM node that the inbound call arrives on also has an instance of the selected outbound trunk for that call then use this node to onward route the call The Route Local rule can eliminate call set up traffic between CUCM nodes within a cluster SIP/H323 ICT Trunk SIP Trunk SIP/H323 ICT Trunk SIP Trunk A SIP Trunk B Route List 10

11 Unified CM Inter Cluster Trunks SIP Trunks vs H.323 Trunks Feature Comparison H.323 (Q.SIG) SIP (QSIG) Support for + character Signalling Authentication and Encryption Media Encryption Run On All Nodes feature Up to 16 destination addresses feature OPTIONS Ping ilbc, AAC, ISAC and G.Clear Support G.711, G.722, G.723, G.729 Support SIP Subscribe / Notify, Publish Presence Accept Audio Codec Preferences in Received Offer TLS QSIG Call Completion No Reply / Busy Subscriber Topology Aware - RSVP Based Call Admission Control SIP Pre-Conditions IPv6, Dual Stack, ANAT BFCP Video Desktop Sharing Legend: 2013 Cisco Yes and/or its affiliates. Limited All rights reserved. support No 11

12 SIP Trunks vs H323 and MGCP Trunks to Gateways SIP Trunks support the Run On All Unified CM Nodes and Up to 16 destination IP addresses features H323 and MGCP Trunks to gateways and 3 rd party UC systems support standard Call Manager Groups and a single destination IP address Using standard Call Manager Groups (rather than Run on All Nodes) increases call set up traffic between nodes within a cluster Multiple Trunks may be required with the single destination IP address limitation Note MGCP Trunks are only active on one node in the Call Manager Group (as the signaling channel is back hauled to CUCM) H323 ICT Trunk H323 Trunk A SIP ICT Trunk MGCP Trunk A H323 Trunk B MGCP Trunk B Route List Selected outbound Trunk Route List Selected outbound Trunk 12

13 IOS Gateway Trunks SIP Trunks, H.323 Gateways, MGCP Gateways Feature Comparison H.323 SIP MGCP Centralized Provisioning Centralized CDR (DS0 Granularity in Unified CM CDR) QSIG Tunneling MLPP (Preemption) Hook-flash Transfer with Unified CM ISDN Overlap Sending Accept Audio Codec Preferences in Received Offer CUCM 8.5 Run On All Nodes feature CUCM 8.5 Up to 16 destination addresses feature Mobility Manager VXML-Based Voice Profile Mgmt OPTIONS Ping TCL/VXML Apps (e.g. for CVP Integration) IPv6, Dual Stack, ANAT 3 Active Nodes in a Call Manager Group 1 Active Node in a Call Manager Group Legend: 2013 Yes Cisco and/or its affiliates. Limited All rights support reserved. No 13

14 Why recommend SIP as the Trunk Protocol for SME designs? Using SIP Trunks only to interconnect leaf UC systems to SME provides real benefits in terms of feature support and design simplicity e.g. : UC 7.1 UC 7.1 UC 7.1 UC 8.5 UC 8.5 UC 8.5 UC 8.5 UC 8.5 UC 8.6 UC 9.0 Support for IPv6 Improved Interoperability using SIP Trunk features Better Codec support Simplified Call Routing SME clusters which need no Transcoders SME clusters which need no MTPs for DTMF mismatches H.264 Video support Improved Interoperability with powerful SIP Trunk LUA scripts BFCP and Encrypted Video support Codec Preference Lists and Codec Preference Pass through UC 9.1 SME CoW with extended Round Trip Times 14

15 New SME Deployment Recommendations SME cluster with no Media Resources SME SIP Trunks MTP-less Early Offer

16 Reasons to use SIP Trunks on SME SME clusters with no Media Resources - Introduction Media Resources Media Resources Leaf Cluster New York Leaf Cluster Los Angeles Media Resources SME Cluster Media Resources Leaf Cluster Europe Ideally, Media Resources such as MTPs, Transcoders, Music on Hold, Conferencing Resources should never be utilized in the SME cluster as this entails hair-pinning media via the media resource associated with the SME cluster Is this design possible? Yes, but it requires the use of SIP Trunks only and a specific SIP Trunk configuration. MTP-less Early Offer 16

17 CUCM SIP Trunk Signaling Feature Review Enabling SIP Early Offer UC 8.5+ SIP Profile Early Offer support for voice and video calls (insert MTP if needed) SIP Line Cisco SIP Phones SCCP Line Newer SCCP Phones SCCP Line MTP Older SCCP Phones SIP Trunk SIP Early Offer SIP Trunk MTP SIP Delayed Offer H323 Trunk MTP H323 Slow Start H323 Trunk H323 Fast Start MGCP Trunk MGCP Gateway SIP Trunk with Early Offer SIP Trunk with Early Offer SIP Trunk with Early Offer SIP Trunk with Early Offer SIP Trunk with Early Offer SIP Trunk with Early Offer SIP Trunk with Early Offer SIP Trunk with Early Offer For Calls from trunks and devices that can provide their IP Address, UDP port number and supported codecs - This information is sent in the SDP body of the initial SIP Invite on the outbound Early Offer Trunk. No MTP is used for the Early Offer For Calls from trunks and devices that cannot provide Early Offer information use the calling device s MTP resources (first) or the outbound trunk s MTPs (second) to create a SIP Offer for an unencrypted voice call. (SRTP and video can subsequently be initiated by the called device) 17

18 SME with no Media Resources SME SIP Trunks MTP less Early Offer SME Cluster Leaf Cluster North America Leaf Cluster Europe All SME Trunks configured as SIP Early Offer for Voice and video (Insert MTP if needed) No media resources (MTPs, Transcoders etc) associated to the SME Trunks Takes advantage of SIP Trunk behaviour based on the following Service Parameter 18

19 CUCM SIP Trunk Signaling SME Deployments MTP-less Outbound Early Offer Outbound SIP Early Offer X So what happens when Unified CM receives an inbound Delayed Offer call on a SIP Trunk and needs to onward route the call over a Early Offer SIP Trunk? And No MTPs are available?? Delayed Offer INVITE without SDP INVITE??? SIP Trunk SIP Trunk Configured as Early Offer BUT with no MTP resources 19

20 CUCM SIP Trunk Signaling MTP-less Outbound Early Offer Inbound Delayed Offer Inbound Delayed Offer Outbound Early Offer No MTPS available.. Call behaviour depends on the value of this Service Parameter.. Fail Call Over SIP Trunk if MTP allocation Fails Default value = False Call proceeds without an MTP.. As a Delayed Offer call Delayed Offer INVITE without SDP Delayed Offer INVITE without SDP SIP Trunk SIP Trunk Configured as Early Offer BUT with no MTP resources 20

21 CUCM SIP Trunk Signaling MTP-less Outbound Early Offer Inbound Early Offer So what happens when Unified CM receives an inbound Early Offer call on a SIP Trunk and needs to onward route the call over a Early Offer SIP Trunk? X As per the Early Offer for voice and video ( insert MTP if needed) feature The call proceeds.. The Early Offer received on the inbound Trunk is sent over the Outbound Early Offer Trunk Early offer INVITE with SDP Early Offer INVITE with SDP SIP Trunk SIP Trunk Configured as Early Offer BUT with no MTP resources 21

22 SME with no Media Resources SME SIP Trunks MTP less Early Offer Delayed Offer Delayed Offer SME Cluster Leaf Cluster North America Early Offer Early Offer Leaf Cluster Europe All SME Trunks configured as SIP Early Offer for Voice and Video (Insert MTP if needed) No media resources (MTPs, Transcoders etc) associated to the SME Trunks If an inbound DO call received on SME SIP Trunk outbound SME Trunk sends DO If an inbound EO call received on SME SIP Trunk outbound SME Trunk sends EO This EO/DO pass-through feature also affects media negotiation Media choices (e.g. codec/ DTMF transport decision) made by the leaf systems 22

23 SME with no Media Resources SME MTP less Early Offer Delayed Offer Call Delayed Offer Delayed Offer Media Resources INVITE 200 OK with SDP (Offer) ACK with SDP (Answer) Leaf Cluster North America Leaf Cluster Europe All SME Trunks configured as SIP Early Offer for Voice and video (Insert MTP if needed) No media resources (MTPs, Transcoders etc) associated to the SME Trunks This EO/DO pass-through feature also affects media negotiation With Delayed Offer Calls - Media choices (e.g. codec decision/ DTMF transport decision) made by the Leaf cluster originating the call Media resources (if needed) are inserted by the originating Leaf cluster 23

24 SME with no Media Resources SME MTP less Early Offer Early Offer Call Early Offer Early Offer INVITE with SDP (Offer) 200 OK with SDP (Answer) Media Resources Leaf Cluster North America Leaf Cluster Europe All SME Trunks configured as SIP Early Offer for Voice and video (Insert MTP if needed) No media resources (MTPs, Transcoders etc) associated to the SME Trunks This EO/DO pass-through feature also affects media negotiation With Early Offer Calls - Media choices (e.g. codec decision/ DTMF transport decision) made by the Leaf cluster receiving the call Media resources (if needed) are inserted by the Leaf cluster receiving the call 24

25 SME with no Media Resources SME SIP Trunks MTP less Early Offer - Summary Media Resources Delayed Offer Delayed Offer Media Resources SME Cluster Leaf Cluster North America Early Offer Early Offer Leaf Cluster Europe This EO/DO pass-through feature affects media negotiation Leaf systems can use SIP Early Offer or Delayed Offer Use Codec Preference Lists to avoid transcoding If a Transcoder is required If MOH, Announcement service is required If Conferencing resources are required If MTPs for DTMF mismatch are required Inserted by Leaf cluster Inserted by Leaf cluster Inserted by Leaf cluster Inserted by Leaf cluster 25

26 SME with no Media Resources Possible with SIP Delayed Offer Trunks Everywhere? Delayed Offer Delayed Offer SME Cluster Leaf Cluster North America Early Offer Media Decision made here Delayed Offer Leaf Cluster Europe All SME Trunks configured as Delayed Offer No media resources (MTPs, Transcoders etc) associated to the SME Trunks All Leaf Systems configured as Delayed Offer? If an inbound DO call received on SME SIP Trunk outbound SME Trunk sends DO Not always possible.. Some UC systems always send Early Offer e.g. IOS gateways Some Leaf UC systems need to receive Early Offer 26

27 SME with no Media Resources Possible with Early Offer SIP Trunks Everywhere? Early Offer Early Offer SME Cluster Leaf Cluster North America Leaf Cluster Europe All SME Trunks configured as Early Offer No media resources (MTPs, Transcoders etc) associated to the SME Trunks All Leaf Systems configured as Early Offer? If an inbound EO call received on SME SIP Trunk outbound SME Trunk sends EO Possible.. But may introduce limitations e.g. For older SCCP based phones (e.g. 7940/ 7960) the Leaf cluster will insert an MTP to create an Early Offer over the outbound SIP Trunk MTP single codec limitation 2013 Cisco and/or - voice its affiliates. All calls rights reserved. only 27

28 New SME Deployment Recommendations SME cluster with no Media Resources Why H323 Inter Cluster Trunks cannot be used

29 Reasons to use SIP Trunks only H323 Slow Start Trunks Media Negotiation TCS TCS = Terminal Capability Set SME Cluster Leaf Cluster North America TCS Leaf Cluster Europe To support calls with voice, video and encryption H323 Slow Start Trunks must be used. Endpoint Media capabilities are sent over H323 Trunks through the exchange of Terminal Capability Set (TCS) messages. The choice of which codec and DTMF transport method is used for the call is determined after Master Slave Determination (MSD). Unlike SIP Trunks using EO ands DO, for H323 Inter Cluster Trunks the choice which cluster choses the media characteristics for the call is not configurable, as the cluster that initiates the TCS exchange and determination of which cluster is Master and Slave is random 29

30 Reasons to use SIP Trunks only H323 Slow Start Trunks Media Negotiation Slave Leaf Cluster North America MSD MSD Media Decision SME Cluster made here MSD = Master/ Slave Determination Leaf Cluster Europe Master Because the cluster that initiates the TCS exchange and determination of which cluster is Master and Slave is randomly selected This can lead to situations where, when a DTMF transport mismatch, or Codec mismatch occurs between the endpoints in call The SME cluster will try to insert media resources Without SME media resources the call, or DTMF transport for the call, will fail Therefore - H323 Trunks cannot 2013 be Cisco used and/or its affiliates. in SME All rights reserved. deployments without media resources 30

31 General SME Deployment Recommendations

32 SME with no Media Resources SIP Trunks DTMF Configuration Media Resources Delayed Offer Delayed Offer Media Resources SME Cluster Leaf Cluster North America Early Offer Early Offer Leaf Cluster Europe SIP Trunks support the following DTMF configurations : OOB and RFC2833 RFC2833 No Preference No Preference Both Out Of Band (OOB) and RFC2833 DTMF must be sent Inband RFC2833 DTMF only Either RFC2833 or OOB can be used The DTMF capabilities of the endpoint are sent in the Offer Default setting (Recommended) If a DTMF mismatch occurs MTP inserted by Leaf cluster 32

33 SIP Trunks SIP OPTIONS Ping Improved Failover. SIP ICT Trunk SIP Trunk CUBE CUBE OPTIONS Ping is activated on a per SIP Trunk basis Each node running the SIP Trunk daemon in the originating cluster uses OPTIONS Ping to determine the availability of each defined destination IP address - CUCM will not attempt to establish a call to an unavailable remote peer - SIP Trunk - In Service whilst one remote peer is reachable - SIP Trunk - Out Of Service state when all remote peers are unreachable 33

34 CUCM SIP Trunk Features Audio Codec Determination In UC 9.0 customizable Codec Preference Lists are added to CUCM regions In addition to the default Lossy and Low Loss audio codec preference lists (previously known as the Link Loss Type ), multiple custom Audio Codec Preference Lists can now be configured. Audio Codec Preference lists can be used for codec selection for calls within a region and between regions. The Maximum Audio Bit rate is still applied for calls within a region and between regions, but rather that using the highest audio quality codec (as per earlier Unified CM releases); the codec selection is now made based on the codec order in the Audio Codec Preference List and the codecs that the endpoints support. 34

35 CUCM SIP Trunk Features Audio Codec Preference Lists Cisco Unified CM Administration>System>Region Information>Audio Codec Preference List An Audio Codec Preference List is a list of all the codec types supported by Unified CM. The preference order of this list of codecs can be modified and saved as custom preference list (Note that codecs cannot be removed from the Audio Codec Preference List). 35

36 CUCM SIP Trunk Features Regions with Audio Codec Preference Lists Cisco Unified CM Administration>System>Region Information>Region Audio Codec Preference Lists can be used for calls within a region and between two regions 36

37 CUCM SIP Trunk Features Audio Codec Preference Lists - Audio Codecs Offered The list of codecs used for codec negotiation during call set up is the subset of codecs supported by the device and those in the codec preference list, limited by the maximum audio bit rate for the region/ region pair. Region A Region A-C Codec Preference List (1) G722 (2) G711 (3) G729 (4).. Region C SIP INVITE Codec preference in Offer SDP (1) G711 (2) G729 Codecs supported by device G711 G729 Region A-C Maximum Audio Bitrate 64 kbps SIP Early Offer Trunk 37

38 CUCM SIP Trunk Features Audio Codec Preference Lists - Audio Codecs Offered The list of codecs used for codec negotiation during call set up is the subset of codecs supported by the device and those in the codec preference list, limited by the maximum audio bit rate for the region/ region pair. Region A Region A-C Codec Preference List (1) G722 (2) G711 (3) G729 (4).. Region C SIP INVITE Codec preference in Offer SDP (1) G729 Codecs supported by device G711 G729 Region A-C Maximum Audio Bitrate 40 kbps SIP Early Offer Trunk 38

39 CUCM SIP Trunk Features Audio Codec Preference Lists Deployment Recommendations Region A Region A-C Codec Preference List (1) G729 (2) G711 (3) G722 (4) Region C Region D Region D-E Codec Region E Preference List G.729 Voice Call (1) G729 (2) G711 (3) G722 (4) Region B FAX Region B-C Codec Preference List (1) G711 (2) G722 (3) G729 (4). Inter Cluster Trunk G.711 Fax Call Cluster 1 Cluster 2 Region D-F Codec Preference List (1) G711 (2) G722 (3) G729 (4) For calls between two Unified CM clusters via SIP or H323 inter cluster Trunks, Audio Codec Preference Lists allow the codec used for a call to be selected based upon the calling and called devices codec preference. Note Equivalent Audio Codec Preference Lists for each device type region should be configured in each cluster to ensure that a common codec is selected for each device types, irrespective of call direction or Trunk configuration. Region F FAX 39

40 CUCM SIP Trunk Features - SIP Profile Accept Audio Codec Preferences in Received Offer Accept Audio Codec Preferences in Received Offer Region A Region A-C Codec Preference List (1) G729 (2) G711 (3) G722 Region C Region D G.729 Call SME Region E Region E-F Codec Preference List (1) G729 (2) G711 (3) G722 Region F Phones Region B FAX Region B-A Codec Preference List (1) G711 (2) G722 (3) G729 Cluster 1 SIP G.711 Call SIP Cluster 2 Region E-G Codec Preference List (1) G711 (2) G722 (3) G729 Region G FAX In deployments where calls can pass through more than one Unified CM cluster, for example SME deployments; the inter-region Audio Codec Preference List of the intermediary Unified CM cluster can over-ride the preferred codec selection between the calling and called device. To ensure that the endpoints codec preferences are honored as calls pass through SME, enable the SIP Profile feature Accept Audio Codec Preferences in Received Offer on all SME SIP Trunks. 40

41 CUCM SIP Trunk Features Unified CM and CUBE SIP Trunk Codec Preference Region A Region A-C Codec Preference List (1) G729 (2) G711 (3) G722 Region C Inbound Dial-Peer Voice Class Codec Preference List (1) G729 (2) G711 (3) G722 G.729 Voice Call Outbound Dial Peer Voice Class Codec Preference List (1) G729 (2) G711 (3) G722 Phones (1) G729 (2) G711 Region B FAX Region B-A Codec Preference List (1) G711 (2) G722 (3) G729 Cluster 1 SIP Trunk G.711 Fax Call by the order defined under voice class 2013 Cisco codec. and/or its affiliates. All rights reserved. CUBE FAX (1) G711 Instead of using dedicated SIP Trunks to CUBE for Voice and Fax calls, a single SIP Trunk and a single inbound & outbound Dial-Peer can be configured on CUBE for all device types. It s recommended to use the same voice class codec preference list for both the inbound & outbound dial-peer containing the list of codecs that you want to negotiate with the service-provider. The order of the codecs will be dictated first, by the order received in the inbound offer and then 41

42 CUCM SIP Trunk Features SIP Trunk Security Profile Information Incoming and Outgoing Transport Types UDP Connectionless Uses SIP Session Timers to determine session state TCP Connection Oriented TCP maintains connection state TLS Connection Oriented Encrypted Signaling Uses X.509 Certificates to authenticate connections should be used if encrypted media (SRTP) is required Incoming port The Transport protocol port number CUCM uses to listen on for inbound SIP connections SIP Messages that the trunk will accept Digest Authentication Less secure than TLS (does not provide integrity or confidentiality) Uses a challenge response mechanism based on a shared username and digest credentials to authenticate connections. Challenger sends Realm (ClusterID) and a nonce value (a random number) to the calling device. Calling device uses the nonce value to create and return an MD5 hash of the Realm s username and digest credentials 42

43 CUCM SIP Trunk Features Transport Layer Security (TLS) X.509 Certificates X.509 Certificates can be : Imported to each server using Platform Administration Certificates may be obtained directly from peer entities (self signed certificates) Signed by an external Certificate Authority More scalable, Easier to manage The X.509 Certificate authenticates the remote trunk to a server / cluster The X.509 Subject Name field in the SIP Trunk Security profile matches the name on a certificate and authorizes its use with the Trunk A TLS Session May be shared for multiple calls Secure Interworking with UCME, CUBE, and Gateways Media Encryption (SRTP) can be set up without secure signaling but in this case security keys are sent in the clear 43

44 CUCM SIP Trunk Features Secure SIP Trunks using TLS and an external CA CA Certificate CA Signed CUCM Certificate Certificate Authority (CA) Leaf Cluster A SIP Inter Cluster Trunk using TLS for signaling encryption Encrypted Media Session Management Edition Cluster Leaf Cluster B 44

45 CUCM SIP Trunk Features Normalization & Transparency SIP Trunk Normalization SIP/SCCP SIP Trunk H323 Trunk SIP Trunk Script SIP Trunk Script SIP Trunk IP PSTN Normalization allows incoming and outgoing SIP messages to be modified on their way through a CUCM SIP Trunk. The Normalization feature is designed to improve interoperability between CUCM SIP Trunks and SIP based 3rd Party SIP PBXs, Applications & IP PSTN services. MGCP Trunk Normalization Script Remove display name from SIP Header function fixinboundpai() local pai = Sip.getHeader("P-Asserted-Identity") local displayname = getdisplayname(pai) local uri = geturi(pai) local number = getuserpart(uri) if displayname == number then Sip.modifyHeader("P-Asserted-Identity", uri) Script SIP Trunk IP PSTN Normalization is independent of what the SIP Trunk connects to on the other side of CUCM. e.g. SIP Skinny H.323 MGCP SIP Trunk calls SIP Trunk calls SIP Trunk calls SIP Trunk calls Normalization uses a scripting environment to allow customers to modify SIP messages and SDP content on a per trunk basis. 45

46 CUCM SIP Trunk Features Normalization & Transparency SIP Trunk Transparency SIP Trunk SIP Trunk SIP Trunk SIP Trunk Script SIP Trunk Script SIP Trunk Script Transparency Script Sip.allowHeader( A-Callid ) Sip.allowHeader( A-ConversationId ) function A.inbound_INVITE Sip.passThroughHeader( A-Callid ) Sip.passThroughHeader( A-ConversationId ) Sip.passThroughHeaderValue("Supported", "x-nortel") Sip.passThroughUriParameters("From", "uriparm1") Sip.passThroughHeaderParameters("From", "hparm1", "hparm2") end Transparency allows CUCM to pass headers, parameters, and SDP content from one SIP call leg to the other. The Transparency feature is designed to improve the operation of and interoperability between 3rd Party SIP PBXs and Applications connected via CUCM/SME. Transparent pass through is only applicable when the call through CUCM is from SIP Trunk to SIP Trunk. SIP Trunk SIP Trunk calls Transparency uses the same scripting environment as Normalization to allow customers to pass SIP messages through CUCM. Transparency and Normalization features can be combined. 46

47 SME Deployments TFTP Services Session Management Edition Cluster With SIP trunks only and no Phones the SME cluster does not need a TFTP server Running a Proxy TFTP service in the SME cluster is generally not advised as - All endpoint TFTP requests go to the Proxy TFTP server(s) in the SME cluster - If the requested file is not found, the Proxy TFTP server then sends the file request to the leaf cluster - When found in the leaf cluster the file is transferred using HTTP to the Proxy server which then sends the file on to the requesting device - Downside files served over the WAN to SME and then over the WAN from SME to device 47

48 Global SME Deployments

49 Signaling Delay and SME based UC networks SME Recommendations for media delay are well defined (ITU Recommendation G.114. < 150mS = acceptable, mS = acceptable with some impact on quality, > 400mS generally unacceptable) Recommendations for signaling delay are not well defined Primarily because the incurred delays are protocol dependent and the impact of long delay generally affects call set up rather than overall 2013 voice Cisco and/or quality its affiliates. All rights reserved.

50 Impact of Signaling Delay on Call Set Up Messages exchanged before the caller hears ringback tone One way signalling Delay INVITE 100 Trying 180 Ringing 200 OK w/ SDP (Offer) ACK w/ SDP (Answer) SME INVITE 100 Trying 180 Ringing 200 OK w/ SDP (Offer) ACK w/ SDP (Answer) Delay before the caller hears the called user after ringback stops Two Way Media Messages exchanged before called user hears the caller after picking up their handset The diagram above shows an example of call set up delays and their impact on the users experience. (Note Phone to Call Agent signaling delay has been assumed to be minimal) Delays during call set up will vary based on the protocol(s) used, the trunk configuration and call agent operation making it difficult to calculate the time taken to establish each stage of the call set up. In most cases, signaling delays do not noticeably affect user experience. If signaling delays are a concern enable PRACK on SIP Trunks. 50

51 Reducing Signalling Delay Pre UC Multiple regional SME clusters SME North America SME Europe Signalling Path SME Latin America SME Asia Pac SME cluster per region - SME clusters fully meshed Leaf clusters have one trunk to nearest SME and optional Trunks to other regional SMEs SIP Trunks only with Run on all Unified CM nodes and multiple destination addresses SME clusters without Media Resources - Recommended SME MTP-less EO SIP Trunks - Recommended 51

52 UC One Global SME cluster Clustered over the WAN with extended RTT (1) All SME CoW+ designs must be approved North America Europe UC 9.1 SME CoW up to 500mS RTT SME CoW+ < 500 ms < 500 ms Latin America Asia Pac One SME Globally distributed SME cluster (mega cluster supported) Leaf clusters must have one trunk to pointing to nearest regional SME nodes Leaf clusters must have additional redundant Trunks to all other regional SME nodes All Trunks run SIP only with Run on all Unified CM nodes and multiple destination addresses Up to 500 ms between call processing nodes, Up to 500 ms between Publisher and Subscribers > 1.5 Mbps between regional SME data centre sites, > 1.5 Mbps between Publisher and Subscribers 52

53 UC One Global SME cluster Clustered over the WAN with extended RTT (2) All SME CoW+ designs must be approved North America Europe UC 9.1 SME CoW up to 500mS RTT SME CoW+ < 500 ms < 500 ms Latin America Asia Pac One SME Globally distributed SME cluster (mega cluster supported) Up to 500 ms Round Trip Time between nodes SME clusters without Media Resources - Mandatory MTP-less EO SIP Trunks - Mandatory - Mandatory SIP trunks only with 2013 Run Cisco and/or on its affiliates. all All Nodes rights reserved. enabled 53

54 SME - Clustering over the WAN with extended RTT Upgrade considerations UC 9.1 SME CoW up to 500mS RTT North America SME CoW+ < 500 ms < 500 ms Europe The database process on the publisher of the SME CoW+ cluster is provided with more CPU threads (using a CLI command) prior to upgrade to reduce DB Replication time this does not impact call processing Latin America Asia Pac The upgrade process for an SME cluster consists of two key parts: Version switch-over, where the call processing node is re-booted and initialized with the new software version (this takes approximately 45 minutes per server), and database replication, where the subscriber's database is synchronized with that of the publisher node. The time taken to complete this database replication phase depends on the RTT between the publisher and subscriber nodes and the number of subscribers in the cluster. The database replication process has a minimal impact of the subscriber's call processing capability and typically can be run as a background 2013 Cisco process and/or its affiliates. during All rights normal reserved. SME cluster Cisco operation. Public 54

55 One Global SME CoW cluster Trunk config from CoW Leaf Cluster to CoW SME cluster DC1 SME Nodes North America 1 st choice Trunk 2 nd choice Trunk UC 9.1 SME CoW up to 500mS RTT Leaf Cluster North America Route List Route List Leaf Cluster Europe 2 nd choice Trunk 1 st choice Trunk DC2 SME Nodes Europe One Globally distributed SME cluster One Leaf cluster SIP Trunk to each pair of SME nodes in every regional data centre Each Leaf Cluster SIP Trunk uses Run on all Unified CM nodes Leaf Cluster SIP Trunk 1 - Multiple destination addresses to each call processing node in DC1 Leaf Cluster SIP Trunk 2 - Multiple destination addresses to each call processing node in DC2 Leaf Cluster Trunks placed into Route Lists and Route Groups for redundancy 55

56 One Global SME CoW cluster Trunk config from SME CoW Cluster to CoW Leaf clusters DC1 SME Nodes North America UC 9.1 SME CoW up to 500mS RTT Leaf Cluster North America Leaf Cluster Europe DC2 SME Nodes Europe One Globally distributed SME cluster One SIP Trunk from SME to each Leaf cluster SIP Trunks configured without media resources MTP-less early Offer Each SME SIP Trunk uses Run on all Unified CM nodes Each SME SIP Trunk uses multiple destination addresses pointing to every call processing node in the destination 2013 Cisco and/or leaf its affiliates. cluster All rights reserved. 56

57 One Global SME CoW cluster CoW Leaf Clusters Call Routing Route Local for SME CoW SME Nodes North America 1 st choice Trunk UC 9.1 SME CoW up to 500mS RTT Leaf Cluster North America Route List Leaf Cluster Europe 2 nd choice Trunk SME Nodes Europe One SME Globally distributed SME cluster Leaf Clusters Multiple Trunks in Route Groups provide ordered selection of SME nodes. Route List Call Distribution priority order nearest data centre 1 st, second nearest data centre 2 nd etc SME CoW cluster Single Trunk with Run on all Nodes enabled pointing to all nodes in each leaf cluster Route local operates in the SME cluster 2013 Cisco and/or No its affiliates. inter All rights node reserved. intra cluster Cisco call Public routing 57

58 Summary SME Design recommendations

59 SIP Trunk Design Recommendations UC version 8.5+ SME Cluster using MTP-less EO and no Media Resources SIP MTP-less Early Offer SIP Delayed/Early Offer SIP Early Offer CUBE IP PSTN CUBE CUBE SIP DO to EO SIP CUCM 8.5+ CUCM 8.5+ CUCM 8.5+ SME Leaf Cluster SIP ICT Trunks - Voice, Video and Encryption supported SIP Delayed Offer/Early Offer (insert MTP if Needed), Run on All Nodes, Multiple Destination Addresses, OPTIONS Ping SME Cluster SIP ICT Trunks - Voice, Video and Encryption supported SIP MTP-less Early Offer, Run on All Nodes, Multiple Destination Addresses, OPTIONS Ping, No Media resources assigned to Trunks CUBE/IOS Gateway/ IP PBX SIP Trunks Typically Voice only, Video and Encryption possible SIP Delayed Offer/Early Offer (EO commonly used), (EO by sent by the CUBE/ IOS Gateways) OPTIONS Ping, Early Offer usually required by Service Providers (Use CUBE SIP DO to EO) 59

60 SIP Trunk Design Recommendations Pre UC 8.5+ SME Cluster using SIP/ H323 Trunks and Media Resources H323 Slow Start SIP Delayed Offer SIP Early Offer CUBE IP PSTN CUBE CUBE SIP DO to EO SIP CUCM 7.1/ 8.0 CUCM 8.5+ CUCM 8.5+ SME Pre UC 8.5 Leaf Clusters and SME H323 ICTs - Voice, Video and Encryption supported H323 Slow Start, Call Manager Groups, 3 Destination Addresses UC 8.5+ Leaf Cluster and SME SIP ICT Trunks - Voice, Video and Encryption supported SIP Delayed Offer, Run on All Nodes, Multiple Destination Addresses, OPTIONS Ping, Media resources required on SME Trunks CUBE/IOS Gateway/ IP PBX SIP Trunks Typically Voice only, Video and Encryption possible SIP Delayed Offer/Early Offer (EO commonly used), (EO by sent by the CUBE/ IOS Gateways) OPTIONS Ping, Early Offer usually required by Service Providers (Use CUBE SIP DO to EO) 60

61 Dial Plan design for SME deployments

62 Dial Plan Aggregation and Number Transformation in SME clusters Basic Principles Number Transformation options Dial Plan and dialing habit variations 62

63 SME Dial Plan Aggregation Basic Principles In the SME cluster a unique globalized dial plan should be implemented Inbound number globalization and outbound number localization can be implemented in the SME cluster Leaf Cluster SME Cluster Leaf UC system In Leaf clusters/ Leaf UC systems a localized dial plan may be implemented and users may have local dialing habits 63

64 SME - Number Normalization Tools Inbound number globalization and outbound number localization can be implemented in SME cluster SME Cluster With Session Management Edition and CUCM, normalisation of calling and called party information can be achieved by using a variety of tools : Transformation calling search spaces on trunk or device pool level Transformations on route patterns Transformations on translation patterns Transformations on route lists This presentation focuses on number transformations at the Trunk level... But first lets look at some variations on dial plan and dialling habit implementations... 64

65 Internal Directory Numbers, +E.164 SME Dial Plan, Abbreviated On Net Dialing Calling Number Called Number Calling Number Called Number Cluster 1 DNs 444-4XXX SME Cluster + E.164 Dial Plan Cluster 2 DNs 555-5XXX Calling Number Called Number Calling Number Called Number Caller ( ) dials Leaf Cluster 1 Internal Directory Numbers (XXX-YYYY) Abbreviated Dialing (8-XXX-YYYY) Leaf Cluster 2 Internal Directory Numbers (XXX-YYYY) Abbreviated Cisco Dialing Public (8-XXX-YYYY) 65

66 Internal Directory Numbers, +E.164 SME Dial Plan, Abbreviated On Net Dialing. All number transformations performed on SME cluster Calling Number Called Number Calling Number Called Number PBX 1 DNs 444-4XXX SME Cluster + E.164 Dial Plan PBX 2 DNs 555-5XXX Calling Number Called Number Calling Number Called Number Caller ( ) dials PBX 1 Internal Directory Numbers (XXX-YYYY) Abbreviated Dialing (8-XXX-YYYY) PBX 2 Internal Directory Numbers (XXX-YYYY) Abbreviated Cisco Dialing Public (8-XXX-YYYY) 66

67 +E.164 Directory Numbers, +E.164 SME Dial Plan, E.164 Dialing Calling Number Called Number Calling Number Called Number Cluster 1 DNs XXX SME Cluster + E.164 Dial Plan Cluster 2 DNs XXX Calling Number Called Number Calling Number Called Number Caller ( ) dials Leaf Cluster 1 + E.164 Directory Numbers E.164 Dialing Leaf Cluster 2 + E.164 Directory Numbers E.164 Dialing 67

68 URI dialing and Inter Cluster look Up Service (ILS)

69 URI Dialing SME and Inter-cluster Lookup Service (ILS) UC9.0 ILS runs as a CUCM service and distributes locally registered URIs to other clusters Cluster to cluster ILS connections can be hub and spoke or full mesh URIs are associated with a cluster route-string (label) e.g. london.uk.eu URIs and their route string are stored locally, partial ILS file updates are supported Diane@cisco.com San Jose Diane@cisco.com Chris@cisco.com Bob@cisco.com Anne@cisco.com SME London Helen@cisco.com Greg@cisco.com Fran@cisco.com Eric@cisco.com Helen@cisco.com Chris@cisco.com Bob@cisco.com San Jose San Jose Diane@cisco.com Chris@cisco.com Bob@cisco.com Anne@cisco.com London Helen@cisco.com Greg@cisco.com Fran@cisco.com Eric@cisco.com London Greg@cisco.com Fran@cisco.com Anne@cisco.com ILS scales 2013 to Cisco 100 and/or of its affiliates. 1000s All of rights entries reserved. (1,000,000 tested) Eric@cisco.com

70 URI Dialing SME and Inter-cluster Lookup Service (ILS) Operation When a user dials a URI CUCM checks to see if it is registered locally If not, CUCM looks for the URI in it s ILS store a match returns the route string for the destination cluster associated with the dialed URI e.g. sanjose.ca.us or london.uk.eu This route string is used to match a SIP route pattern to onward route the call Diane calls Helen@cisco.com Diane@cisco.com Chris@cisco.com Bob@cisco.com Anne@cisco.com San Jose Does Route Is String Diane@cisco.com Chris@cisco.com Helen@cisco.com london.uk.eu Bob@cisco.com Anne@cisco.com a locally No match an registered existing SIP Route URI Pattern? San Jose Route the URI call to london.uk.eu Can over Helen@cisco.com Return Yes Route String the Route Pattern s be london.uk.eu found in ILS? for SIP Trunk London Helen@cisco.com Greg@cisco.com Fran@cisco.com Eric@cisco.com Yes URI Helen@cisco.com SME London Helen@cisco.com Greg@cisco.com Fran@cisco.com Eric@cisco.com ILS scales 2013 to Cisco 100 and/or of its affiliates. 1000s All of rights entries reserved. (1,000,000 tested) London San Jose Diane@cisco.com Chris@cisco.com Bob@cisco.com Anne@cisco.com Helen@cisco.com Greg@cisco.com Fran@cisco.com Eric@cisco.com

71 ILS UC9.0 Hierarchical Routing & Route String Summarization Each cluster does an ILS look up and makes a local routing decision to its next hop based on the returned ILS route string e.g. Helen@cisco.com london.uk.eu ---> SIP Trunk A Route string summarization allowed e.g. size Routes to : *.*.EU *.*.APAC San Jose.CA.US New York.NY.US Singapore.Asia.APAC SIP Trunk A or *.*.APAC SIP Trunk A further reducing dial plan Global Backbone US SME EU SME Asia SME San Jose New York London Frankfurt Seoul Singapore Default Route to US SME

72 SME and Call Admission Control (CAC)

73 Multi Branch Leaf clusters provide Locations based CAC ICTs in Location Phantom Phantom Locations allow the originating location of each call to be sent over ICTs Phantom ICT-CL1 Phantom ICT-CL2 1 2 Phantom ICT-SME SME Phantom ICT-SME Central Site Cluster 1 Central Site Cluster 2 Cluster 1 Locations CAC 80k Deduction for Location B WAN Cluster 2 Locations CAC 80k Deduction for Location F Location B - 80 kbps Branch 1 Cluster 1 SIP Trunk Call Signaling Location Association Media Branch 2 Cluster 2 Location F - 80 kbps 73

74 Multi Branch Leaf clusters - Locations CAC Call Transfer Phantom Locations allow the originating location of each call to be sent over ICTs Phantom ICT-CL1 Phantom ICT-CL2 1 2 The originating location of the inbound transferred call is returned to cluster 1 Phantom ICT-SME SME Phantom ICT-SME Central Site Cluster 1 Cluster 1 Locations CAC 0 kbps Deduction for Location B (0 WAN Calls) 4 3 WAN Central Site Cluster 2 Cluster 2 Call Transferred to Cluster 1 Location B Transfer Location B No WAN calls Branch 1 Cluster 1 SIP Trunk Call Signaling Location Association Media Branch 2 Cluster 2 Location F No WAN calls 74

75 UC 9.0 Enhanced Locations CAC - SME and Multi Branch Leaf clusters E-LCAC introduces : The concept of Links inter-connecting Locations Sharing Topology information (Locations/ Links/ Link Bandwidth) using Location Bandwidth Manager (LBM) Dynamic distribution between clusters of bandwidth usage on Links between locations Each Cluster builds a global topology of Locations and Links Locations can be shared A B C D E F G SME Local Locations Shadow ICT-CL1 Global Topology Hub Shadow ICT-CL2 Link X-Hub B/W = 256k Location X Hub Location Y Link Z-Hub B/W = 512k Location Z Leaf Clusters define their Locations SME defines all Locations and Links SME - Transparent Hub Location SME distributes global topology information to all clusters Global Topology Hub Shadow ICT-SME Shadow ICT-SME Global Topology Hub A B C D E F G Central Site Cluster 1 Local Locations Cluster 1 A B C D WAN Central Site Cluster 2 A B C D E F G Cluster 2 Local Locations D E F G

76 SME Cluster Sizing

77 SME Cluster Sizing Summary Guidance Voic System CUBE PSTN CUBE Cisco Unified Session Management Edition Cluster Conferencing System SIP CUCM Clusters with SIP Trunks CUCM Clusters with SIP Trunks IP PBXs with SIP Trunks PBXs with SIP Gateway Trunks Basic User Traffic information required to size your SME cluster : Number of Users Average User Busy Hour Call Attempts (BHCA) Average Call Holding Time (CHT) % Off Net Traffic (Off Net to PSTN via SME) % On Net Traffic % Intra cluster Traffic 77

78 SME Cluster Sizing Additional SME traffic Voic System CUBE PSTN CUBE Cisco Unified Session Management Edition Cluster Conferencing System SIP CUCM Clusters with SIP Trunks CUCM Clusters with SIP Trunks IP PBXs with SIP Trunks PBXs with SIP Gateway Trunks Additional Traffic information used to size your SME cluster : Calls to centralized Voic Calls to centralized Conferencing Contact Centre Agents Higher BHCA Single Number Reach Calls to the PSTN via SME Work with your Cisco account team or partner to size your SME cluster using the SME sizing tool

79 Complete Your Online Session Evaluation Give us your feedback and you could win fabulous prizes. Winners announced daily. Receive 20 Cisco Daily Challenge points for each session evaluation you complete. Complete your session evaluation online now through either the mobile app or internet kiosk stations. Maximize your Cisco Live experience with your free Cisco Live 365 account. Download session PDFs, view sessions on-demand and participate in live activities throughout the year. Click the Enter Cisco Live 365 button in your Cisco Live portal to log in. 79

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