Cisco CP-7911G-CH1 System Administrator Manual page 304

How to Use Cisco Unified SRST Gateways as a Multicast MOH Resource
Note
• If the POTS caller on hold does not hear a sound, Cisco Unified CM has successfully completed the
multicast MOH handshaking with the Cisco Unified SRST gateway, and the gateway is failing to
pick up the locally generated multicast RTP stream.
Use the show ccm-manager music-on-hold command to investigate.
Router# show ccm-manager music-on-hold
Current active multicast sessions : 1
Multicast
Address
===================================================================
239.1.1.1
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Cisco Unified SCCP and SIP SRST System Administrator Guide
304
Appendix B: Integrating Cisco Unified Communications Manager and Cisco Unified SRST to Use Cisco Unified SRST
The show ccm-manager music-on-hold command displays information about PSTN
connections on hold only. It does not display information about multicast streams going to
IP phones on hold.
Router# show ccm-manager music-on-hold
Current active multicast sessions : 1
Multicast RTP port
Address number
===================================================================
239.1.1.1 16384
If no MOH streams are shown (that is, there are no rows of data beneath the columns),
Cisco Unified Communications Manager was not correctly configured to provide the
Cisco Unified SRST gateway with MOH. Configuration errors might include that the required
codec has not been enabled on Cisco Unified Communications Manager (check the service
parameters) and that no MRGL was assigned to the gateway, or, if one was assigned, it has
insufficient resources. Check Cisco Intrusion Detection System (Cisco IDS) Event Viewer for
error messages.
RTP port
number
16384 326/326
If no MOH streams are shown, Cisco Unified CM was not correctly set up to provide the
Cisco Unified SRST gateway with MOH. A typical error is that Cisco Unified Communications
Manager was not configured with an appropriate MOH resource. The configuration error might
be that the required codec has not been enabled on Cisco Unified CM (check the service
parameters) or that no MRGL was assigned to the gateway, or, if one is assigned, it has
insufficient resources. Check the IDS Event Viewer for error messages.
Verify that the multicast address and RTP port number shown in the show ccm-manager
music-on-hold command output match the multicast-address and port arguments in the
moh multicast command configuration.
Verify that the Packets in/out field shows a count that is incrementing. Repeat the show
ccm-manager music-on-hold command to verify that the Packets in/out counters are
incrementing.
Verify that the codec field matches the codec type of the audio file stored in the
Cisco Unified SRST gateway's flash memory. If another codec value besides G.711 mu-law or
G.711 a-law appears in the show ccm-manager music-on-hold command output, review the
Cisco Unified CM region for incorrect codec configuration. See the
MOH Server" section on page
Packets Call
in/out id
326/326 42
Packets Call Codec
in/out id
42 G.711ulaw
295.
Codec Incoming
Interface
G.711ulaw Lo0*
Incoming
Interface
Lo0 *
"Creating a Region for the
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