An Overview of ISDN on the IMG
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- Brenda Nelson
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1 An Overview of ISDN on the IMG The IMG supports Integrated Services Digital Network (ISDN) for multiple communications tasking (voice, data, compressed), 128 Kbps high-speed and highbandwidth service. ISDN, non-compressed (512 KBps compressed) also provides ondemand service, connects up to eight devices simultaneously, and can be callmanaged. The basic configuration is 23+D (Primary Rate Interface) and 30B+D outside of North America. The IMG interfaces to various equipment types supporting the ISDN PRI protocol, including tandem (Class 4) switches and end office (Class 5) switches. The IMG ISDN PRI implementation is based on ITU-T Q.921 and Q.931 specifications. Each implemented variant references the appropriate interface document supplied by the equipment manufacturer. The interface document is usually a variant of the ITU-T recommendations. The IMG supports up to 32 D channels. Each D channel provides the High Data Link Control (HDLC) communications over T1, E1, or DS3 on one timeslot on the span. Each D channel can control up to 19 other spans in addition to the span on which it is located. National ISDN PRI NI 2 The IMG supports National ISDN PRI NI 2. National ISDN PRI supports Non-Facility Associated Signaling (NFAS), allowing up to 30 DS1 interfaces and the D channel backup procedure, as well as B channel availability and provisioning. Connection endpoint variants are defined for National ISDN User side and Network side. Depending upon your provisioning requirements, you can have one D channel per span [Facility Associated Signaling (FAS)], or one D channel managing up to 20 spans [Non-Facility Associated Signaling (NFAS)]. You can control a total of 32 spans using all FAS D channels, or up to 20 spans per NFAS D channel (to a maximum of 64 spans per system). You can intermix both FAS and NFAS D channels with each supporting a different variant. Supported Features 32 D channels per-img over T1/DS3 24 D Channels over or E1 (21 bearer + 3 signaling spans) ITU-T Q.921, Q.931-based Variants T1 Network Side Variants National-ISDN 2 ATT 4ESS Q.931 PRI ATT5ESS Q.931 PRI (Custom) Northern Telecom DMS-100 Q.931 PRI (Custom) Northern Telecom DMS-250 Q.931 PRI JATE 1
2 ISDN T1 User Side Variants National-ISDN 2 JATE E1 Network Side Variants Euro-ISDN E1 User Side Variants Euro-ISDN D channel backup NFAS The IMG supports the D channel backup procedure as defined by Lucent TR This procedure provides a standby D channel when using NFAS. When an active D channel fails, or if there is a span alarm, the IMG converts to the standby D channel and maintains active calls. This is a provisioned option and is applicable only when using NFAS. D channel backup is supported on the T1 only. NFAS is supported over T1 with the NI-2, 4ESS/5ESS, and DMS 100/250 variants. It is not supported over E1 with the Euro ISDN variant, or over T1 with the JATE variant. Incoming B channel Negotiation Interworking with SS7 ISUP SS7 - ISDN Interworking Brief Description The IMG supports interworking between ISDN and SS7. Benefits For Interworking between ITU ISUP and ISDN IMG follows Q.699 recommendation. For Interworking between ANSI ISUP and ISDN IMG follows T1.609 recommendation Provides cost effective TDM to SS7 ISUP switch. Limitations Fallback procedures are not supported in IMG, hence any interworking related to that is also not supported. Supplementary services are not supported in the IMG Related Topics Interworking Call Flows - ISDN to SS7 ISUP. 2
3 An Overview of ISDN Configuration Prerequisites Creating a Facility Object Summary of Steps The following is a summary of the basic ISDN configuration. 1. Configure ISDN Signaling 2. Configure ISDN Routing ClientView Panes for ISDN Configuration ISDN Signaling ISDN D Channel ISDN Group ISDN Circuits ISDN Timers Channel Group The following illustration shows the objects in the Client View Configuration Tree that relate to ISDN Configuration. 3
4 ISDN 4
5 Configuring ISDN Signaling Follow the procedures below to configure a D Channel on the IMG. Configuring a D Channel 1. Right-click Signaling and select New ISDN. 2. Right-click ISDN D Channels and select New ISDN D Channel. The ISDN D Channel pane appears. 3. Complete the fields as required. Refer to the ISDN D Channel pane reference for details. Configuring ISDN Timers To change the default timer values on a D Channel, perform the following: 1. Right-click the ISDN entry and select New ISDN Timers. The ISDN Timers pane appears. 2. Change timer values as required. Next Task Configuring ISDN Routing 5
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7 Configuring ISDN Routing Summary of Tasks 1. Create an ISDN Channel Group 2. Define an ISDN Channel Group 3. Configure Bearer Capabilities Override 4. Assign B-Channels (Circuits) to be controlled by the D Channel Creating an ISDN Channel Group 1. Under Cantata IMG EMS, right-click Routing Configuration and select New Routing Configuration. 2. Right-click Routing Configuration and select New Channel Groups. 3. Right-click Channel Groups and select New Channel Group. The Channel Group pane appears. 4. In the Signaling Type field select ISDN. 5. Select other fields as required. See the Channel Group pane reference for details. Defining an ISDN Channel Group 1. Right-click the ISDN channel entry and select New ISDN Group. 7
8 ISDN The ISDN Group pane appears. 2. Select values as required. See the ISDN Group pane reference for details. Configuring Bearer Capabilities Override To set Transmission Medium Requirements (TMR) and User Service Indicator (USI) parameters: 1. Right-click the ISDN Group entry and select Bearer Capabilities Override. The Bearer Capabilities Override pane appears. 2. Make selections in each field as required. See the Bearer Capabilities Override pane for details. Assigning B-Channels (Circuits) to be controlled by the D Channel 1. Right-click the ISDN group entry and select New ISDN Circuits. The ISDN Circuits pane appears. 2. Fill in fields as required. See the ISDN Circuits pane GUI Reference for details. 8
9 NFAS Examples Both these examples do not affect the already configured channels running calls. Both these scenarios show a single Channel Group called ISDN_Inbound. You could also have separate Channels Groups with the 2 scenarios mentioned with the same results. Example 1: Multiple ISDN Circuits within the same ISDN Group Step #1: Create 2 spans (Span 0, Span 1). The D-Channel is on span 0 and the first facility span is 1. Step #2: Add another Facility (Span 2) to the ISDN Group. Example 2: Multiple ISDN Groups Step 1: Configure 2 spans (Span 0, Span 1). The D-Channel is on span 0 and the first facility span is 1. 9
10 ISDN Step 2: Add another Facility (span 2) to the new ISDN Group. This allows you to set attributes such as Bearer Capabilities and Network Type differently from the other ISDN Group. 10
11 ISDN Call Flows Basic ISDN to SIP Call Flow Basic SIP to ISDN Call Flow Basic ISDN to H.323 Basic ISDN to SIP Call Flow Basic SIP to ISDN Call Flow 11
12 ISDN Basic ISDN to H
13 Channel Group Pane Description This pane defines incoming and outgoing attributes for a channel. It identifies the tables to be used for routing and translating calls. It also identifies the IP bearer profiles for H.323 channel groups. NOTE: Many of the parameters that you specify for a channel group are defined as routing-related tables. Therefore, you must define the applicable tables at the routing level before you can assign them to a channel group. Related Topics Creating a Channel Group Creating_an_H_323_Channel_Group Creating a SIP Channel Group Creating_an_SS7_Channel_Group Creating an ISDN Channel Group Accessing this Pane Cantata IMG EMS -> Routing Configuration -> Channel Groups-> Channel Group Maximum Objects: 672 per EMS Technical Notes When configuring a Channel Group, the following happens: Incoming and attributes to be used while routing calls to/from the channel group are configured. Pane 13
14 ISDN Field Descriptions Name This field identifies the name of the Channel group. ID A unique ID for this Channel Group. Channel Group Function This field identifies the direction of calls on this Channel Group. Incoming/Outgoing Trunks: Two way traffic (only valid option for IP Channels) Incoming Trunks: One way traffic, Incoming only (not valid option for IP Channels) Outgoing Trunks: One way traffic, Outgoing only (not valid option for IP Channels) Signaling Type The signaling to be performed on this Channel Group. SS7 14
15 Channel Group H323 ISDN SIP Incoming Translation Table Identifies the Incoming translation table that the IMG uses for digit translation and error detection for incoming calls received on this Channel Group. Route Table Identifies the route table to be used for routing calls received on this Channel Group. Incoming Treatment Indicates the way in which the IMG releases a failed incoming call. Play Treatment Release w/cause Cause Code Mapping Table Specifies an override treatment for a cause code, enabling you to customize the cause codes with alternate treatments. None Incoming IP Profile Indicates the IP characteristics for incoming Voice over IP calls on this Channel Group, including voice encoding compression, payload size, echo suppression, and other parameters. This applies to H.323 and SIP channel groups only. Outgoing Translation Table Indicates the outgoing translation table that the IMG uses for digit translation for outgoing calls on this channel Group. Hunting Options This field specifies the hunting algorithm used for selecting a channel to route an outgoing call. Alternate Even Alternate Odd LRU (Lease Recently Used) Most Idle Round Robin Clockwise 15
16 ISDN Round Robin Counter Clockwise Sequential Bottom Up Sequential Top Down Outgoing Treatment Specifies the way in which the IMG releases a failed outgoing call. Play Treatment Release w/cause Ingress Side will Play Call Progress Tones This field specifies if the incoming side will play call progress tones or not. True False Outgoing IP Profile Identifies the IP characteristics for outgoing Voice Over IP calls on this Channel Group, including voice encoding compression, payload size, echo suppression, and other parameters. This applies to H.323 and SIP channel groups only. Treatment Table Identifies the treatment table that the IMG uses if a call fails and the outgoing treatment is set to Release w/cause. TreatmentTable ID: 1: Primary TreatmentTable ID: 2: Secondary Reattempt Cause Code The IMG will automatically attempt to re-route calls in response to the following cause codes: 42,41,34. Use this field to select up to 4 additional Cause Codes for which the IMG will re-attempt a new call, per trunk group. Receive Gain/Transmit Gain Configures the Input and Output Gain on a per Channel Group basis for TDM and RTP channels. Transformations are allowed from -21 db to +18 db in 3 db increments. When 0 db is selected the transformation option is disabled Clipping - In the case of TDM to TDM calls, the combined Receive and Transmit Gain will be clipped at +18 db. For example, if channel group A had the Receive gain set to +12 db and channel group B had its Transmit gain set to +10 db, and the call was flowing from A to B, one would expect +22 db of gain. However, the IMG will 16
17 Channel Group implement clipping, so the gain on this call would be +18 db. It will work the same in the reverse direction as well. Gain Control is not supported for pre-call announcements, treatments, or ringback. The following fields relate to Overlap Signaling. See Overlap Signaling for more information. Overlap Enable Enable Enable overlap signaling on inbound Channel Groups when the outbound channel group does not support Overlap Signaling (SIP, H.323). The IMG will collect address digits until a Termination Condition is met and then continue call processing. See below for protocol-specific information. Overlap is only applied to the inbound channel, even on an Incoming/Outgoing Trunk. Disable (default) By default, the IMG passes digits to the outbound side as they are received. Termination Digits Digit to indicate end of overlap sending. Default for SS7 Channel Group = # Not used for ISDN Minimum # of Digits The minimum number of digits that the IMG will wait for (collect) in the incoming side before attempting an outseize on the outgoing side (default = 24) NOTE: This field is different from the Max # CdPN digits (IAM) field in the ISUP Group pane, which applies to the outgoing ss7 calls. Inter SAM Timeout Time to wait for another SAM digit before continuing with call processing. Default = 1500 Not used for ISDN Total Overlap Timeout 17
18 ISDN Amount of time to wait for either Minimum # of Digits or Inter SAM timeout to occur before continuing with call processing. Default = LNP Based Routing Enable Disable (default) See Local Number Portability (LNP). Informational Fields 18
19 ISDN Circuits Pane Description Use this pane to assign B-Channels to a D-Channel. Related Topics Assigning B-Channels (Circuits) to be controlled by the D-Channel Accessing this Pane Cantata IMG EMS-> -> Routing Configuration -> Channel Group -> ISDN Group -> ISDN Circuits Maximum Objects: 480 per ISDN Group Pane Field Descriptions IMG Interface Type of Circuits Bearer Signaling Start Interface Offset Beginning span in this Circuit Group. Start Channel Beginning channel in this Circuit Group. End Interface Offset Last span in this Circuit Group. 19
20 ISDN End Channel Last channel in this Circuit Group. Start Facility Number The number of the first Facility in the group. Informational Fields Trunk Type Informational Field - The trunk type of this Circuit Group. B Channel Count Informational Field - The number of B Channels in this Circuit Group. Channel Count Informational Field This is the total number of channels, including D- Channels, on the span. 20
21 ISDN D Channel Pane Description Use this pane to configure an ISDN D Channel. Related Topics Overview of ISDN Configuration Configuring a D-Channel Accessing this Pane Cantata IMG EMS -> Logical IMG -> Physical IMG -> Signaling -> ISDN -> ISDN D Channels -> New ISDN D Channel Maximum Objects: T1 32/ E1-24 per Physical IMG Pane Field Descriptions Primary Interface - Offset The span on which the primary D Channel is located. Primary Channel The channel on which the primary D Channel is located. NFAS Supported Indicates if NFAS is supported on the D Channel. Yes (default) No 21
22 ISDN Secondary Interface - Offset If NFAS is enabled, the span on which the secondary D Channel is located. Secondary Channel If NFAS is enabled, the channel on which the secondary D Channel is located. Base Variant The base ISDN variant used. The default is National-ISDN 2 Network Side. T1 Network Side Variants National-ISDN 2 ATT 4ESS Q.931 PRI ATT 5ESS Q.931 PRI (Custom) Northern Telecom DMS-100 Q.931 PRI (Custom) Northern Telecom DMS-250 Q.931 PRI JATE T1 User Side Variants National-ISDN 2 JATE E1 Network Side Variants Euro-ISDN E1 User Side Variants Euro-ISDN B Channel Selection Determines the hunt method for selecting B Channels. Linear Clockwise (default) Linear Counter Clockwise Circular Clockwise Circular Counter Clockwise HDLC Bit Polarity Normal (default) 22
23 ISDN D Channel Inverted Network Side Layer 2 Override Options vary depending on variant. Location The value populated in the Location parameter in the Cause IE when a call is released. User (0 - Message Generated by User) (default) Private Network (1 - Message generated by private network serving the local user) Local public network (2 - Message generated by public network serving the local user) Transit network (3 - Message generated by transit network) Remote public network (4 - Message generated by public network serving the remote user) Remote private network (5 - Message generated by private network serving the remote user) International network (7 - Message generated by international network) Network Beyond Interworking Point (0A - Message generated by network beyond inter-working point) Informational Fields D Channel Status In Service Out of Service Active Standby Not Aligned Secondary D Channel Status In Service Out of Service Active Standby Display Table 23
24 ISDN This table shows all of the D Channels configured. 24
25 ISDN Group Pane Description Use this pane to configure an ISDN Group. Related Topics Defining an ISDN Channel Group Accessing this Pane Cantata IMG EMS-> -> Routing Configuration -> Channel Group -> ISDN Group Maximum Objects: T1-32/ E1-24 per Channel Group Pane Field Descriptions ISDN D channel The D Channel that provides signaling for this group. Network Type Do Not Include Network-Specific Facilities (NSF) IE ATT Software Defined Network ATT Megacom 800 Service ATT Megacom ATT Accunet ATT Long Distance Service ATT International 800 ATT Multiquest Northern Telecom Private Net Northern Telecom InWats Northern Telecom OutWats Northern Telecom Foreign Exchange 25
26 ISDN Northern Telecom Tie Trunk Northern Telecom TRO Call Bearer Capabilities Allowed Voice (default) 3.1 KHz audio Unrestricted 56K Unrestricted 64K Restricted 64K 384K 7.1 KHz Audio Discard Privacy Info Option selected is removed from the outgoing SETUP message. See Configuring SIP Privacy. Off (default except for ISDN B Channels) Display Only (default for ISDN B Channels) Generic Number Only Display and Generic Number Calling Party Only Display and Calling Number Calling, Display and Generic 26
27 ISDN Signaling Pane Description This a container object for configuring ISDN D Channels. After creating this object, right-click on ISDN D Channels and select New ISDN D Channel. Related Topics An Introduction to ISDN Overview of ISDN Configuration Configuring ISDN Signaling Accessing this Pane Cantata IMG EMS -> Logical IMG -> Physical IMG -> Signaling -> ISDN Maximum Objects: 1 per Physical IMG 27
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29 ISDN Timers Description Use this pane to change default ISDN Timers, if required. Related Topics Configuring ISDN Timers Accessing this Pane Cantata IMG EMS -> Logical IMG -> Physical IMG -> Signaling -> ISDN D Channels - > ISDN D Channel -> ISDN Timers Maximum Objects: 1 per ISDN Signaling object Pane Field Descriptions Q931 T303 (10 ms) The value for ISDN Timer T303, in 10 ms increments. Q931 T305 (10 ms) The value for ISDN Timer T305, in 10 ms increments. Q931 T308 (10 ms) The value for ISDN Timer T308, in 10 ms increments. Q931 T310 (10 ms) The value for ISDN Timer T310, in 10 ms increments. 29
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