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Configuring Voice Ports

UnderstandingQSIG

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QSIG Overview

Q Signaling protocol

ISDN-based signaling protocol

Based on Q.931

Allows feature transparency between different vendor PBXsTwo layers:

Basic call defines the signaling procedures and protocol for thepurpose of circuit-switched call control at the Q reference pointbetween PINXs. Explained in Standard ECMA-143.

Generic function defines the signaling protocol for the controlof supplementary services and additional network features.Explained in Standard ECMA-165.

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QSIG Features

Basic call

Call completion

Call diversion

Call transfer Identification services

Message waiting indication service

Path replacement

Do not disturb and override

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Cluster A asks Cluster Cvia Cluster B for path

replacement to DN 1000.

User B

DN: 2000

Path Replacement (Cont.)

Cluster C establishesa new circuit to A.

Cluster A andCluster C

Switch over.

User ADN: 1000

User A calls User B.

User CDN: 3000

1

User B transfers to User C.2

4

5

6

User B drops off.3

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BRIRouter(config)# isdn switch-type basic-qsigPRIRouter(config)# isdn switch-type primary-qsigRouter(config)# card type t1 0

Voice-EnabledRouter

IP Network

PBX Voice-EnabledRouter PhonePBX

QSIGT1/E1 or BRI Channel

QSIGT1/E1 or BRI Channel

Configuring Global QSIG Support for BRIor PRI Example

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QSIG over PRI Interface ConfigurationExample

Voice-EnabledRouter

IP Network

PBX Voice-EnabledRouter PhonePBX

QSIGT1/E1 Channel

QSIGT1/E1 Channel

Router(config)# controller t1 0/1Router(config-controller)# pri-group timeslots 1-24Router(config)# interface serial 0/1:23Router(config-if)# isdn switch-type primary-qsigRouter(config-if)# isdn protocol-emulate user OR Router(config-if)# isdn protocol-emulate network

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QSIG over BRI Configuration Example

Voice-EnabledRouter

IP Network

PBX Voice-EnabledRouter PhonePBX

QSIGBRI Channel

QSIGBRI Channel

Router(config)# interface bri 1/1Router(config-if)# isdn layer1-emulate user OR Router(config-if)# isdn layer1-emulate networkRouter(config-if)# isdn incoming-voice voiceRouter(config-if)# isdn protocol-emulate user OR Router(config-if)# isdn protocol-emulate network

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Verifying Controllers

router# show controllers t1 0/1/0T1 0/1/0 is up.

Applique type is Channelized T1Cablelength is long gain36 0db

No alarms detected.alarm-trigger is not setSoaking time: 3, Clearance time: 10AIS State:Clear LOS State:Clear LOF State:ClearVersion info Firmware: 20051006, FPGA: 20, spm_count = 0Framing is ESF, Line Code is B8ZS, Clock Source is Line.CRC Threshold is 320. Reported from firmware is 320.Data in current interval (601 seconds elapsed):

2 Line Code Violations, 3 Path Code Violations601 Slip Secs, 0 Fr Loss Secs, 2 Line Err Secs, 1 Degraded Mins601 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

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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 (user-side) router and thenetwork

Debugging QSIG Trunks

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Summary

QSIG allows feature transparency between differentvendor PBXs.

QSIG can be configured over PRI or BRI.

Various show and debug commands are available to verify theQSIG connection.

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