Appendix B: Integrating Cisco Unified Communications Manager and Cisco Unified SRST to Use Cisco Unified SRST
How to Use Cisco Unified SRST Gateways as a Multicast MOH Resource
304
Cisco Unified SCCP and SIP SRST System Administrator Guide
OL-13143-04
Note
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 Packets Call Codec Incoming
Address number in/out id Interface
===================================================================
239.1.1.1 16384 326/326 42 G.711ulaw Lo0*
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.
•
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 RTP port Packets Call Codec Incoming
Address number in/out id Interface
===================================================================
239.1.1.1 16384 326/326 42 G.711ulaw Lo0 *
–
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
“Creating a Region for the
MOH Server” section on page 295
.
