Specifications

5-2
Cisco MGX 8260 Command Line Interface Guide
Release 1.2, Part Number 78-10987-01 Rev. B0, January, 2002
Chapter 5 Call Control
Understanding MGCP
• Media Gateway Control Protocol (MGCP)
The MGX 8260 Media Gateway exchanges switching information with MGCs using either MGCP
or IPDC over an IP network. The protocol choice depends on the specific network. The physical
transport is Ethernet at the MGX 8260 interface.
• IP Device Control (IPDC)
The MGX 8260 Media Gateway exchanges switching information with MGCs using either MGCP
or IPDC over an IP network. The protocol choice depends on the specific network. The physical
transport is Ethernet at the MGX 8260 interface.
• Backhaul
The MGX 8260 Media Gateway tunnels ISDN Layer 3 (Q.931) messages through the IP network
to and from each MGC. At the ISDN interface, the MGX 8260 Media Gateway implements ISDN
Layer 2 (Q.921).
Understanding MGCP
This section describes how to configure and view MGCP (Media Gateway Control Protocol). The MGX
8260 Media Gateway implements the standard MGCP protocol stack (see Figure 5-1).
Figure 5-1 MGCP Protocol Stack
The protocol stack contains the following layers:
• MGCP
• UDP (User Datagram Protocol)
• IP (Internet Protocol)
• Physical—Ethernet LAN
The following diagram shows how to configure MGCP IP addresses in a fully-redundant system (see
Figure 5-2).
MGCP
C
onfigure core settings
3
1945
IP
Physical
UDP
C
onfigure IP addresses