SIP as an Enabling Technology

Transcription

1 SIP as an Enabling Technology SIP and VoIP Fundamentals Mike Taylor - CTO spscom.com Strategic Products and Services / 300 Littleton Road / Parsippany, NJ 07054

2 Agenda What is SIP? Acceptance of SIP SIP Economics? Leveraging SIP for Mobility SIP and Business Continuity

3 What is Session Initiation Protocol? Text Based Signaling Protocol IETF 3261 Think HTTP Signaling for Voice, Video, IM/Chat or. Separate from Media Media SS7 ISDN SIP The more it changes the more it stays the same!

4 SIP is a Signaling Protocol SIP is the language that devices speak to set up phone calls (or other types of communications) between devices. After the call is set up, the device uses Real Time Protocol (RTP) for the talk path (just like H.323) SIP uses English (people can read it) messages to communicate between endpoints. This is good and bad. Security concerns. SIP is not proprietary it is developed as an industry standard protocol! 4

5 SIP vs. H.323 Both of these protocols are IEEE industry standard signaling protocols They are not proprietary H.323 Mature protocol that can support a large set of call control features SIP Is maturing and call control features are currently being added Does not yet support the full set of call control features as is in H.323 today Has the promise of much more because this protocol has the potential to do much more 5

6 SIP vs. H.323 These are simply signaling protocols with IEEE RFC documents that describe the details of the protocol spec The specific method of SIP implementation is up to the provider of the product being used In general, each SIP implementation will be a little different Most SIP termination devices will have Adaption Modules to account for these differences H.323 is a more mature protocol where most of the interoperability issues have been resolved 6

7 Why is SIP so Important? SIP is being adopted by EVERYONE as the industry standard signaling protocol. This includes Avaya, Microsoft, Cisco, WorldCom, AT&T, CommWorks, Google, Lucent and Yahoo! 7

8 5 Building Blocks of SIP User Agents Network Servers SIP Messages Session Description Protocol Gateways and SBCs 8

9 SIP Components User Agent Client (UAC) : It generates requests and send the request to servers - typically Proxies or Registrars User Agent Server (UAS) : It gets requests, processes those requests and generate responses. Back-To-Back User Agent (B2BUA) : Both UAC and UAS A UA can be either a UAS or UAC dependent on which UA initiated the request for the media session. It is also possible that a UA could be operating as both a UAS and UAC especially during a three-way call or call transfer. 9

10 SIP User Agents User agents (UAs) are applications installed on SIP endpoints such as an IP phone, mobile phone, wireless device, or a laptop / desktop PC that interface between the user and the SIP network. SIP UAC/UAS SIP UAC/UAS 10

11 SIP Network Servers Network servers provide: Registrar and Location services Routing (Proxy or Redirect) Presences Services Servers in the network allow easy session establishment! 11 SIP Network Server

12 SIP Method Description SIP Messages Simple Yet Powerful SIP Method INVITE Description Invites a user to a call ACK BYE Used to facilitate reliable message exchange for INVITEs Terminates a connection between users or declines a call SIP UAC/UAS CANCEL Terminates a request, or search, for a user OPTIONS REGISTER Solicits information about a server's capabilities Registers a user's current location SIP Network Server 12 INFO Used for mid-session signaling SIP UAC/UAS

13 Session Description Protocol (SDP) SDP is used for multimedia session announcement, invitation and other forms session initiation SDP determines following additional information: Bandwidth Contact info for the person responsible for the media type Transport protocol Media format Multicast address and Transport Port for media. Remote address for media / Transport port for contact address. Once the SIP session is built, SDP adds multimedia

14 Gateways and Session Border Controllers SIP Gateways Provide protocol translation and interoperability with non-sip system elements such as: TDM H.323, and PSTN Session Border Controllers (SBCs) Provide robust security and management by: Allowing SIP communications to transition enterprise firewalls Solving NAT traversal issues As firewalls, preventing unauthorized access to and from an enterprise network. 14

15 SIP Simplifies Networks A Single Pipe to the Cloud Phones LAN PBX Router TDM External Communications TDM External Communications IP Data/Telephony Internal Communications PSTN Long Distance PSTN Local Access IP Network VoIP for internal communications only Separate TDM interfaces required for external communications with partners/suppliers/customers Extra cost, extra hardware, extra complexity VoIP Today PBX SIP Trunking Phones LAN Router IP Data/Telephony All Communications PSTN Long Distance Service Provider SIP Network PSTN Local Access Single IP link for voice/data Eliminate PSTN interfaces for longdistance and local access Save 20%+ on toll charges Prepare for future SIP solutions

16 SIP An ecosystem that broadens your app universe! Adaptable For different users, needs, industries Simple to use and deploy Contextual How and where you work Business process integration Inclusive Architecture Leverage best in class apps from across solution providers Multi-Modal Speech, mobile devices, PCs, phones Video, Web 2.0, collaboration, kiosks

17 ACCEPTANCE OF SIP

18 ($M) SIP Disaggregates Voice Networks Runs on TCP, UDP or SCT protocols More cost effective that IP Can carry rich UC to interconnect applications more effectively 300 Worldwide SIP Trunking Line Penetration, : Comparison of May 2008 and December 2009 Forecast Line Centric User Centric 150 Voice Calls Multimedia Sessions Administered User Control Individual Routing Centralized Policy December 2009 Forecast May 2008 Forecast Source: IDC

19 SIP ECONOMICS

20 Better Manageability SIP is easy to learn, develop, troubleshoot and support Modeled after HTTP, easier to understand and interpret Single network for all communications Enhanced scalability From single road warrior to small branch to carrierclass enterprise solutions with common applications and user experience Lower Communications and Business Costs Cost saving SIP trunking Reduced PBX hardware Minimize travel with collaborative applications Leverage multimodal communications to eliminate the costs of delayed decision making Reduce cost of real estate and optimize geographic coverage with a more mobile workforce

21 Administrative Savings In English Easy to Troubleshoot and Understand

22 SIP Trunking Setting the Stage: Voice as an Application AFTER SIP-based Architecture: Underutilized PRIs from multiple vendors are collapsed onto a single handoff using a shared pool of concurrent call paths BEFORE PRI-based Architecture: Capacity managed site-by site Each site requires sufficient headroom Small sites have dramatic under-utilization

23 Case Study Example: 1,250 Seat Organization 5:1 User-to-SIP Trunk drives 250 sessions (11) T1 equivalent $4,050 savings per month $57.60 per channel month for PRI $41.40 per channel month for SIP $16.2 savings per month x 300 channels Gartner report: Session Mediant 4000 MSRP at $19,750

24 SIP can also Reduce Hardware Costs Reduce HARDWARE components Reduce FOOTPRINT requirements Reduce POWER consumption And this is not even using a high density gateway!

25 Times of Change Savings! Before 8 full racks of equipment After 3 racks of equipment Think of the hardware savings energy savings space savings power savings maintenance contracts T1 management reduction

26 Disaster Recovery SIP traffic is data and can be re-routed. This includes DID numbers! Do not necessarily have double the trunks to provide a 100% back up, just the access pipe Carrier Location A Location B

27 Native Mobility Integration A single SIP Address Of Record (AOR) provides a unifying public address for all communications SIP intelligence allows simultaneous or sequential ringing to all devices End-point Flexibility Seamless integration of desk phones, video devices, soft clients or mobile phones and devices Eliminate the complexity of multiple networks Simplify business processes Unprecedented Interoperability Open, IETF Standard based Active working groups (SIPit, SIPconnect, SIP Forum) Wide applications eco-system

28 Productivity Presence Understand availability and communication preferences before initiating communications Enhanced Constituent Service Speed first call resolution in the contact center through ability to leverage available experts and use side-bar communication channels Faster decision making improves responsiveness to customers Improved ability to reach the right employee drives customer satisfaction Improved Employee Productivity Integrate communications into business processes Maximize workforce effectiveness regardless of location Improve employee satisfaction and retention by providing the tools to work most effectively

29 What Can Presence Look Like?

30 Typical SIP Architecture Carrier SIP SBC Remote Worker Or Mobile Device Enterprise Session Border Controller Enterprise Session Manager Active Enterprise IP-PBX Core Enterprise Session Border Controller Enterprise Session Manager Active Enterprise IP-PBX Backup Session Border Controller Security SIP Normalization Demarcation Session Manager SIP Registrar Session Management Application Integration Dial Plan Routing

31 How do You Realize the Savings from SIP? Avaya AuraTM Savings Estimator Sales Engineering SIP Economic Assessment Service Solution Architecture Services Financial Monitoring Services Business & Technical Planning Services Implementation Services

32 1 Current State Discovery & Analysis Current State Discovery & Analysis Example Deliverable: IT Network Diagram You can easily find anything in your IT Infrastructure with complete Drill-Down Details

33 Example Deliverable: SIP Payback Optimize payback by using SIP in 2 ways: 1. Internal SIP (Migrating Voice traffic to the Data Network) 2. External SIP (Connectivity to the PSTN) All options yield a positive return but a combined view accelerates the return in less than 2 years

34 QUESTIONS?

35 Thank You spscom.com Strategic Products and Services / 300 Littleton Road / Parsippany, NJ 07054