© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Cisco IP Communications PSTN and PBX Integrations Implementing QSIG Trunks

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v QSIG Overview Q-Signaling Protocol or Q-Point Signaling Protocol ISDN-based signaling protocol Based on Q.931 Allows feature transparency between different vendor PBXs Two layers: –Basic call describes how to set up calls between PBXs. –The Generic function enables the transparent passage of facility and notify messages. –Supplementary Services provide additional functions for large- scale corporate, educational, and government networks.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v QSIG Overview (Cont.) QSIG features: Basic Call Call Completion Call Diversion Call Transfer Identification Services Message Waiting Indication Service Path replacement

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v QSIG Overview (Cont.) Path Replacement: Allows efficient connection between two parties in a call Can occur –After a QSIG transfer by a join –By forward switching only in Cisco Unified CallManager Is sensitive to –Dial plans –Routing patterns

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Cluster A asks Cluster C via Cluster B for path replacement to DN User B DN: 2000 Path Replacement QSIG Overview (Cont.) Cluster C establishes a new circuit to A. Switch over. User A DN: 1000 User A calls User B. User C DN: User B transfers to User C User B drops off. 3

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v QSIG Overview (Cont.) Cisco Call Back feature: Allows a subscriber to receive a notification when the called party line becomes available User can press the Call Back button while receiving a –Busy tone –Ringback tone –Reorder tone

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Call Back QSIG Overview (Cont.) User A DN: 1000 User B DN: 2001 User C DN: 2001 Call established between B and C. 2 A calls B and receives a busy signal. 3 A presses Call Back button. 4 B-C call ends. 6 QSIG message line is free 7 QSIG message callback please 5 B calls C. 1 A calls B. 8

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v QSIG Support on Cisco IOS Gateways QSIG Support T1 PRI yes E1 PRI yes T1/E1 CAS no E&M, FXS, FXO no Cisco Unified CallManager BRI no

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v QSIG Support in Cisco Unified CallManager History: Introduced in Cisco Unified CallManager Release 3.3 –Only basic call functionality Enhanced in Cisco Unified CallManager Release 4.0 –Many of the mostly needed features added Commonly used feature support completed in Cisco Unified CallManager Release 4.1 and later

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v QSIG Support in Cisco Unified CallManager (Cont.) QSIG support: Active platforms –Cisco 1751, 1760, 2801, 2600XM, 2691, 2811, 2821, 2851, 3725, 3745, 3825, and 3845 Interfaces –VWIC-1MFT-T1/E1, VWIC-2MFT-T1/E1, VWIC-2MFT-T1/E1-DI, VWIC- 1MFT-G703, VWIC-2MFT-G703, AIM-VOICE-30, AIM-ATM-VOICE-30, NM-HD-1V/2V/2VE, NM-HDV, and NM-HDV2 Protocols –Gateway QSIG basic features –Call agent Additional features provided by the call agent through support services.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v QSIG Configuration Commands pri-group timeslots timeslot-range service mgcp router(config-controller)# Configures the logical voice ports on a T1/E1 controller

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v network-clock-participate {aim | slot | wic} slot number router(config-if)# Specifies which clock source to use for DSP clocking isdn protocol-emulate {user | network} router(config-if)# Defines Layer 2 and Layer 3 user- or network-side emulation QSIG Configuration Commands (Cont.) isdn bind-l3 ccm-manager router(config-if)# Binds ISDN Layer 3 to the Cisco Unified CallManager

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Configuring QSIG in Cisco Unified CallManager Deployments User A DN: 1000 User B DN: 2001 User C DN: 2001 QSIG Trunk

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Configuring QSIG in Cisco Unified CallManager Deployments (Cont.) Perform these steps to configure a gateway for Cisco Unified CallManager-controlled QSIG signaling: 1. Configure the host name. 2. Configure DSP clocking. 3. Activate MGCP. 4. Configure MGCP control through the Cisco Unified CallManager.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Configuring QSIG in Cisco Unified CallManager Deployments (Cont.) Configures MGCPs control through the Cisco Unified CallManager router(config)#hostname GW11 ! GW11(config)# ! network-clock-participate wic 0 ! mgcp ! ccm-manager config server ccm-manager config ccm-manager mgcp !

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Configuring QSIG in Cisco Unified CallManager Deployments (Cont.) Perform these steps to configure a QSIG gateway in Cisco Unified CallManager: 1. Create a new gateway. 2. Configure an interface. 3. Configure QSIG. 4. Start the services.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Configuring QSIG in Cisco Unified CallManager Deployments (Cont.)

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Configuring QSIG in Cisco Unified CallManager Deployments (Cont.) Select the interface to configure with QSIG. The domain name must match the configured IOS host name of the gateway.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Configuring QSIG in Cisco Unified CallManager Deployments (Cont.) Choose a PRI connection.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Configuring QSIG in Cisco Unified CallManager Deployments (Cont.) Configure the QSIG settings with the proper selection order and IE type to ensure correct time lot allocation.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Configuring QSIG in Cisco Unified CallManager Deployments (Cont.) Configure the correct line coding and framing. Also make sure the clock source is set correctly.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Open the Cisco CallManager Servicability dialog box. Configuring QSIG in Cisco Unified CallManager Deployments (Cont.)

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v These services must be activated under Tools-> Service Activation for the Cisco Call Back feature. Configuring QSIG in Cisco Unified CallManager Deployments (Cont.)

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Verifying QSIG Trunks debug isdn q921 router# Displays ISDN Q.921 (layer 2) debug information debug isdn q931 router# Displays information about call setup and teardown of Layer 3 ISDN network connections between the local router (user-side) and the network

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Verifying QSIG Trunks (Cont.) show controllers interface-name interface-number router# Displays Layer 1 information show isdn status router# Validates Layer 1 and Layer 2 debug isdn events router# Display ISDN events occurring on the user side of the ISDN interface

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Verifying QSIG Trunks (Cont.) GW11#show debugging The following ISDN debugs are enabled on all DSLs: debug isdn error is ON. debug isdn q931 is ON. (filter is OFF) [... output omitted...] *Mar 4 13:25:20.698: ISDN Se0/2:15 Q931: RX

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Verifying QSIG Trunks (Cont.) GW11#show debugging The following ISDN debugs are enabled on all DSLs: debug isdn error is ON. debug isdn q931 is ON. (filter is OFF) [... output omitted...] *Mar 4 13:27:51.549: ISDN Se0/2:15 Q931: RX

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Verifying QSIG Trunks (Cont.) GW11#show isdn status Global ISDN Switchtype = primary-net5 %Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 0. Layer 3 output may not apply ISDN Serial0/2:15 interface dsl 0, interface ISDN Switchtype = primary-qsig **** Slave side configuration **** L2 Protocol = Q.921 0x0000 L3 Protocol(s) = CCM MANAGER 0x0003 Layer 1 Status: ACTIVE Layer 2 Status: TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED Layer 3 Status: 0 Active Layer 3 Call(s) Active dsl 0 CCBs = 0 The Free Channel Mask: 0xFFFF7FFF Number of L2 Discards = 0, L2 Session ID = 8 Total Allocated ISDN CCBs = 0 Status of E1 QSIG

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Summary QSIG allows feature transparency between different vendor PBXs. Path replacement enables a PBX to switch an existing conversation to an optimized voice path. The Cisco Call Back function allows the user to get an information when a called party number is no longer busy. Since Cisco Unified CallManager Release 4.0, all important QSIG features are supported. Configuring a QSIG trunk between a PBX and the Cisco Unified CallManager requires configuration steps on the IOS gateway and the Cisco Unified CallManager. Various commands can be used to verify the QSIG connection.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v