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
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Cisco Unified SCCP and SIP SRST System Administrator Guide
OL-13143-04
Verifying Cisco Unified SRST Multicast MOH to IP Phones
To verify that Cisco Unified CM is signaling the IP phone to receive Cisco Unified SRST multicast
MOH correctly, perform the following steps.
Step 1
Verify that an IP phone caller hears MOH when placed on hold by an IP phone caller.
Use an IP phone to call a second IP phone, and put the second caller on hold. The second caller should
hear MOH.
Step 2
Check the MOHMulticastResourceActive and MOHUnicastResourceActive counters.
Use the Performance window to check the MOHMulticastResourceActive and
MOHUnicastResourceActive counters under the Cisco MOH Device performance object. See
Step 2
in
the
“Verifying Cisco Unified Communications Manager Multicast MOH” section on page 296
. For
Cisco Unified SRST multicasting MOH to work, the multicast counter must increment.
Troubleshooting Tips
If no MOH is heard and the Cisco Unified SRST MOH signaling is multicasting, connect a sniffer to the
PC port on the back of IP phone. If the IP phone and Cisco Unified SRST gateway are connected to the
same subnet, multicast RTP packets must be detected at all times, even when the IP phone was not placed
on hold. If the IP phone and the Cisco Unified SRST gateway are not connected to the same subnet,
multicast RTP packets are detected only when the IP phone is placed on hold and sends an Internet Group
Management Protocol (IGMP) Join to the closest router.
Configuring Cisco Unified SRST for MOH from a Live Feed
The following sections describe the configuration tasks for Cisco Unified SRST MOH live feed:
•
Prerequisites, page 307
•
Restrictions, page 307
•
Setting Up the Voice Port on the Cisco Unified SRST Gateway, page 307
•
Setting Up the Directory Numbers on the Cisco Unified SRST Gateway, page 309
•
Establishing the MOH Feed, page 309
•
Verifying Cisco Unified SRST MOH Live Feed, page 311
To configure MOH from a live feed, establish a voice port and dial peer for the call and then create a
“dummy” phone or directory number. The dummy number allows for making and receiving calls, and
the number is not assigned to a physical phone. It is that number that the MOH system autodials to
establish the MOH feed.
The
moh-live
command allocates one of the virtual voice ports from the pool of virtual voice ports
created by the
max-dn
command. The virtual voice port places an outgoing call to the dummy number;
that is, the directory number specified in the
moh-live
command. The audio stream obtained from the
MOH call provides the music-on-hold audio stream.
We recommend that the interface for live-feed MOH is an analog E&M port because it requires the
minimum number of external components. Connect a line-level audio feed (standard audio jack) directly
to pins 3 and 6 of an E&M RJ-45 connector. The E&M WAN interface card (WIC) has a built-in audio
transformer that provides appropriate electrical isolation for the external audio source. (An audio
