Information Technology Reference
In-Depth Information
Figure 3-3
illustrates MGCP PRI/BRI backhaul.
FIguRE 3-3
MGCP PRI/BRI
Backhaul
CUCM
(MGC/Call Agent)
Q.931
Q.921
PSTN
V
Media Gateway
(MG)
MGCP is a popular gateway control protocol for several reasons, including the following:
■
MG configuration is simplified because call control and dial plan are centralized on the MGC.
■
Dial plan management and administration is simplified because of its centralization on the MGC.
■
Cisco MGCP MG can be configured to switch over from a primary to backup CUCM in the event of a failure of the primary.
(There can be two backups in addition to the primary.) Similarly, Cisco MGCP gateways can be configured to fall back to
using H.323 for call control in case gateways are unable to communicate with any CUCMs.
■
Active calls are preserved when an MGCP gateway switches over to a backup CUCM.
■
Active analog and T1 CAS calls are preserved in the event of fallback to H.323. Any active PRI calls that are being
backhauled to CUCM are not preserved during fallback.
When integrating an IOS MGCP gateway with CUCM, you can download the majority of the configuration from a CUCM.
To automatically download the configuration from a CUCM, you only need two commands:
■
ccm-manager config server {
ip-address
|
dns
-
name
}:
Specifies the IP address or DNS name of the CUCM from which you
want to download the configuration.
