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To implement an MGCP gateway in CUCM, as shown in Figure 3-3, you have to add the
gateway to CUCM by choosing Device > Gateway. Then you add MGCP endpoints to
the gateway, and finally you configure the endpoints. You must manually enter all the
settings for the MGCP gateway in CUCM. CUCM doesn't have an automated technique
such as an SNMP query of the gateway hardware to fill in the MGCP gateway fields.
NOTE You can find more information about the MGCP protocol and MGCP gateway
characteristics in Cisco Voice over IP (CVOICE), Third Edition. It covers MGCP
gateway implementation with CUCM in detail. This book offers only a high-level review
of MGCP gateway implementation.
Chapter 3: Implementing Multisite Connections
Example 3-1 illustrates the commands that need to be entered into the MGCP gateway for
the topology shown in Figure 3-4. In this example a single El line is installed in the gateway
and connected to the PSTN.
Only the highlighted commands were manually configured. The rest of the commands were
added via TFTP
Example 3-1 MGCP Gateway Configuration
c o n t r o l l e r E1 0/3/0
framing hdb3
linecode crc4
p r i - g r o u p t i m e s l o t s 1-31 service mgcp
i n t e r f a c e S e r i a l 0 / 3 / 0 : 15
i s d n s w i t c h - t y p e primary-net5
i s d n incoming-voice voice
i s d n bind-13 ccm-manager
ccm-manager mgcp
ccm-manager music-on-hold
ccm-manager c o n f i g server 10.1.1.1
ccm-manager c o n f ig
mgcp
mgcp c a l l - a g e n t 10.1.1.1 2427 s e r v i c e - t y p e mgcp version 0.1
mgcp r t p unreachable timeout 1000 a c t i o n n o t i fy
mgcp modem passthrough v o i p mode nse
mgcp p a c k a g e - c a p a b i l i t y rtp-package
mgcp p a c k a g e - c a p a b i l i t y sst-package
mgcp p a c k a g e - c a p a b i l i t y pre-package
no mgcp p a c k a g e - c a p a b i l i t y res-package
no mgcp p a c k a g e - c a p a b i l i t y fxr-package
no mgcp timer r e c e i v e - r t cp
mgcp sdp simple
mgcp r t p payload-type g726r16 s t a t ic
mgcp p r o f i l e d e f a u lt
After the MGCP gateway and its endpoints have been added and configured in CUCM, the
MGCP gateway itself needs to be configured. CUCM stores an Extensible Markup Language
(XML) configuration file at its TFTP server, which can be downloaded by the MGCP gateway.
If this configuration server feature is used, the gateway needs to be configured with
only two commands (ccm-manager config server IP address of Cisco TFTP and ccmmanager
config), as shown in Example 3-1. The rest of the configuration is automatically
downloaded and applied to the Cisco IOS MGCP gateway. Additional MGCP dial peers
might also be automatically added to the MGCP configuration, depending on the MGCP
endpoints previously configured in CUCM.
H.323 Gateway Implementation
Figure 3-4 MGCP Gateway Implementation, Continued
NOTE Be careful when using these automated MGCP commands, because they
automatically reserve all DSP resources for all digital channels present in the gateway.
Potentially, this may not leave available DSP resources for hardware conference bridges
or transcoding. Many engineers choose not to enter these two commands, and instead
enter all commands manually.