Cisco Cisco IOS Software Release 12.4(11)T

The following example forces the MGCP gateway to place the direction attribute in the SDP:

Router# conf t 

Enter configuration commands, one per line. End with CNTL/Z. 

Router(config)# mgcp behavior comedia-sdp-force enable 

Router(config)# exit 

Use the show mgcp command to verify feature configuration.

The following sample output displays the status of media source checking and the gateway role. 

Router# show mgcp

MGCP Admin State ACTIVE, Oper State ACTIVE - Cause Code NONE

MGCP call-agent: 7.7.0.201 2497 Initial protocol service is MGCP 1.0 

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MGCP Dynamic payload type for NTE is 99

MGCP rsip-range is enabled for TGCP only.

MGCP Comedia role is PASSIVE 

MGCP Comedia check media source is ENABLED

MGCP Comedia sdp force is DISABLED 

MGCP Guaranteed scheduler time is DISABLED 

MGCP DNS stale threshold is 30 seconds 

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debug mgcp media—shows address and port detection. Used to determine if source address and 
port has been detected for the call. 

debug mgcp packet—shows MPCP messages and SDP contents. Used to see remote SDP and local 
SDP. Verify the direction attribute in each.

Make a call in the NAT network, one in the CPE to Public direction and one in the Public to CPE 
direction. Verify two-way voice is heard in both scenarios. Alternately, verify SDP direction 
attribute and source port/address dection using MGCP debugs.

This section provides the following configuration examples: