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Using Cisco Unified Communications Manager to Configure MGCP Gateway Support
Configuring MGCP PRI Backhaul and T1 CAS Support for Cisco Unified
Communications Manager
This section describes the procedures for enabling MGCP PRI backhaul support on the Cisco VGD 1T3
voice gateway.
Prerequisites
The following prerequisites must be met to configure MGCP PRI backhaul support:
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Restrictions
The following restrictions apply to configuration of MGCP PRI backhaul support:
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Information About MGCP PRI Backhaul and T1 CAS Support
To configure MGCP PRI backhaul, you should understand the following concepts:
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MGCP PRI Backhaul Overview
MGCP PRI backhaul is a method for transporting complete IP telephony signaling information from an
ISDN PRI interface in an MGCP gateway to Cisco Unified Communications Manager using a highly
reliable TCP connection. The gateway uses a single TCP connection to backhaul all ISDN D channels
to Cisco Unified Communications Manager. The "SAP/Channel ID" parameter in the header of each
message identifies individual D channels. In addition to carrying the backhaul traffic, the TCP keepalive
mechanism also determines MGCP voice gateway connectivity to an available call agent.
MGCP PRI backhaul terminates all ISDN PRI Layer 2 (Q.921) signaling functions on the MGCP
gateway while, at the same time, packaging all the ISDN PRI Layer 3 (Q.931) signaling information into
packets for transmission to Cisco Unified Communications Manager through an IP tunnel over a TCP
connection. This ensures the integrity of the Q.931 signaling information that passes through the
network for managing IP telephony devices. A rich set of user-side and network-side ISDN PRI calling
functions is supported by MGCP PRI backhaul.
Cisco IOS Release 12.4(20)YA.
QSIG signaling is required to support supplementary services over the T1 time-division
multiplexing (TDM) trunks that support the PRI backhaul mechanism.
Integrated access, in which the channels on a T1 or E1 interface are divided between a group used
for voice and another group used for WAN access, is not supported when voice is controlled by
Cisco Unified Communications Manager through MGCP.
T1 and E1 protocols, such as QSIG, E1 R2, T1 FGD, and PRI NFAS, are not supported with MGCP
only with H.323.
E1 CAS is not supported.
Do not add the application mgcpapp command to dial peers that support PRI backhaul.
MGCP PRI Backhaul Overview, page 139
ISDN NSF in Route Patterns, page 140
Cisco VGD 1T3 Voice Gateway Software Configuration Guide
Configuring MGCP Gateway Support
139
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