MC-414

Configuring Support for PBX Signalling Protocols

Configuring Q.SIG PRI Signalling Support

–ECMA 142: Specification, Functional Model and Information Flows for Control Aspects of Circuit Mode Basic Services in Private Telecommunication Networks.

–ECMA 141: Private Telecommunications Networks Inter-exchange Signalling Data Link Layer Protocol.

–ECMA 165: Generic Functional Protocol for the Support of Supplementary Services.

•Provides compatibility with H.323 for IP call setup and transport of Q.SIG messaging.

•Provides support for calls that do not require a bearer channel for voice transport.

•Provides support for bandwidth-on-demand, utilizing network resources only when a connection is desired.

Configuring Voice over IP Q.SIG Network Transparency on the Cisco AS5300

Integration of Q.SIG support with VoIP enables Cisco voice switching services to connect PBXs, key systems, and CO switches that communicate by using the Q.SIG protocol.

In Cisco IOS Release 12.1, Q.SIG PRI signalling on the Cisco AS5300 applies only to VoIP.

The Q.SIG protocol is a variant of ISDN D-channel voice signalling. It is based on the ISDN Q.921 and Q.931 standards and is becoming a worldwide standard for PBX interconnection. By using Q.SIG signalling, Cisco devices can route incoming voice calls from a private integrated services network exchange (PINX) device across a WAN to a peer Cisco device, which can then transport the signalling and voice packets to a second PINX device.

Note In Cisco IOS Release 12.1, the Cisco AS5300 supports ISDN PRI only when a Q.SIG connection to the PINX is configured on the T1/E1 controller.

Q.SIG allows the user to place Q.SIG calls into and receive Q.SIG calls from Cisco VoIP networks. The Cisco packet network appears to PBXs as a large, distributed transit PBX that can establish calls to any destination served by a Cisco voice node. The switched voice connections are established and torn down in response to Q.SIG control messages that come over an ISDN PRI D channel. The Q.SIG message is passed transparently across the IP network and the message appears to the attached PINX devices as a transit network. The PINX devices are responsible for processing and provisioning the attached services.

Figure 96 shows an example of a Q.SIG signalling configuration. In this example, the Cisco AS5300 acts as either a master to a slave PBX or as a slave to a master PBX.

Figure 96 Cisco AS5300 Q.SIG Signalling Configuration

			Cisco
			Cisco
	PBX		AS5300
	PBX	Q.SIG	AS5300
		Q.SIG	No. 1
3001		E1/T1 channel	No. 1
	Slave
			Master

Cisco
Cisco
AS5300		PBX
AS5300	Q.SIG	PBX
No. 2	Q.SIG
No. 2	E1/T1 channel
	E1/T1 channel
Slave		Master
Slave		Master

4001

22864

The following restrictions and limitations apply to the Cisco AS5300 Q.SIG implementation:

•Q.SIG functionality on the AS5300 requires Cisco IOS Release 12.0(7)T or later and VCWare version 4.04.

Cisco IOS Multiservice Applications Configuration Guide

MC-413 specifications

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