Issues with Multicast MOH with CUCM SRST Sites

Question

Hi there,
I am having an issue streaming multicast music on hold at remote sites by sourcing the music on hold from the local flash of the Cisco 2951.
I am running CUCM 9.1(2) SU1, I have 1 x PUB and 1 x SUB. I have enabled the PUB to stream unicast MOH and have enabled multicast MOH on the SUB. Base IP: 239.1.1.1 and Port 16384.
I have set the MOH Region to all remote sites regions to G.711 and have put the SUB into an MRG and have enabled MOH at the MRG and Audio Source Level as per documentation. The MRGL for remote sites contain the local sites hardware resources such as MTP, CFB and XCODE. Second to that MRG, I have set the MOH_MRG containing the SUB enabled for multicast.
When a remote site user put the PTSN caller on hold, I can see an active multicast music on hold session active on the local router but the PSTN caller hears silence !!! The number of In/Out packet on the multicast session does not increase at all.
Could you please help me guys? I have tried all options and still I am getting silence all the times.
Below is the configuration on the local gateway at remote sites:
XX-XXX-VG01#sh run | s call-m
call-manager-fallback
max-conferences 4 gain -6
transfer-system full-consult
ip source-address 10.114.80.1 port 2000
max-ephones 58
max-dn 120
transfer-pattern 031580....
keepalive 10
call-forward pattern 031580....
moh "music-on-hold.au"
multicast moh 239.1.1.1 port 16384 route 10.114.80.1 1.1.1.1
time-zone 29
time-format 24
date-format dd-mm-yy
Please note that when the PSTN caller is on hold, when I issue the # show ccm-manager music-on-hold, I get the following output all the times:
XX-XXX-VG01#sh voice call status
CallID     CID  ccVdb      Port        Slot/DSP:Ch  Called #   Codec    MLPP Dial-peers
0x17740    22AA 0x3D1D09A4 0/0/0:15.4       0/1:2   4312       g711ulaw 200/202
1 active calls found
XX-XX-VG01#sh 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   0/0              96064 g711ulaw            
XX-XXX-VG01#sh ephone summary
hairpin_block:
Max 58, Registered 0, Unregistered 0, Deceased 0 High Water Mark 59, Sockets 0
ephone_send_packet process switched 0
Max Conferences 32 with 0 active (4 allowed)
Skinny Music On Hold Status - group 0
Active MOH clients 0 (max 210), Media Clients 0, B-ACD Clients 0
File music-on-hold.au (not cached) type AU Media_Payload_G711Ulaw64k 160 bytes
Moh multicast 239.1.1.1 port 16384 route 10.114.80.1 1.1.1.1
I can confirm that the flash of the local router has indeed the music-on-hold.au file
XX-XXX-VG01#dir flash:
Directory of flash0:/
  247  -rw-      496521  Sep 20 2014 10:30:06 +02:00  music-on-hold.au
  263  -rw-    90063932  Sep 22 2014 11:24:06 +02:00  c2951-universalk9-mz.SPA.152-4.M6a.bin
256503808 bytes total (141819904 bytes free)

Answer 1

Hi Rachel,
The IP address CUCM selects is based on the codec and the audio stream.
See the following URL. http://voiceonbits.com/2010/06/29/moh-issues-and-resolution/
I borrowed this table from that URL and cleaned up the port numbers.  Hopefully this helps.
Inc. Multicast on IP Address
Inc. Multicast on Port Number
Audio Stream
Codec
Dst. IP Address
Dst. Port
Dst. IP Address
Dst. Port
1
G.711 ulaw
239.1.1.1
16384
239.1.1.1
16384
1
G.711 Alaw
239.1.1.2
16384
239.1.1.1
16386
1
G.729
239.1.1.3
16384
239.1.1.1
16388
1
Wideband
239.1.1.4
16384
239.1.1.1
16390
2
G.711 ulaw
239.1.1.5
16384
239.1.1.1
16392
2
G.711 Alaw
239.1.1.6
16384
239.1.1.1
16394
2
G.729
239.1.1.7
16384
239.1.1.1
16396
2
Wideband
239.1.1.8
16384
239.1.1.1
16398