multicast MoH on SRST router

cjrchoi11 · ‎02-22-2010

Hi,

As per CUCM SRND multicast MoH call details, looks the multicast MoH is care the IP address only which means not care the port number.

ex,

-cucm configure to 239.1.1.1 port 16384, check mark 'port incremental', g711 codec between MoH server and SRST site IP Phones

-srst configure to 239 1.1..1 port 16444 x.x.x.x x.x.x.x

call establishment between two IP Phones in SRST site and press Hold button on one of IP Phone, the Holdee will receive multicast MoH from local SRST router with IP address 239.1.1.1.

->what about the port requirement at this time? Is the Holdee receiving multicast MoH traffic from 239.1.1.1 with regardness the port or must mach the port (16384) which configured in CUCM? I don't see the port number match requirement from CUCM SRND doc and want to know the exact behavior,

Advise please,

Aaron Harrison · ‎02-26-2010

Hi

The phones will be instructed by CCM to listen to a particular mcast group (i.e. IP address). Apparently they don't subscribe to a particular port, so the UC SRND recommends you increment the IP Address, not port.

On CCM, you can choose between incrementing the IP Address (i.e. source 1 = 239.1.1.1 16384, source 2 = 239.1.1.5 port 16384 etc), or the Port (source 1 = 239.1.1.1 16384, source 2 = 239.1.1.1 16392).

Note that the ports or IPs don't increment one at a time, they jump up depending on which codec you are transmitting etc.

As long as you have configured the gateway to stream to the same IP/port that the CCM will instruct the phones to listen to (i.e. if you are incrementing on IP and using source 2, then set it to 239.1.1.2 16384) then it will work.

See this section of the SRND:

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/moh.html#wp1043705

Please rate helpful posts...

Aaron

Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate!

Rachel Au · ‎12-18-2014

Hi

I am trying to set up multicast for music on hold on the cucm 9.

on the cucm, I enable multicast audio sources on MOH server, using base IP 239.1.1.1, and set increment multicast on " ip address"

however the multicast IP address keep changing, sometimes its 239.1.1.1, then after a while it suddenly change to 239.1.1.2 etc..

here is the config on our srst router ( which specify the multicast ip is 239.1.1.1):

is there any way that the multicast ip do not keep changing as its affecting the MOH at the moment.

" config for MOH"

telephony-service
video
srst mode auto-provision none
srst dn template 1
srst dn line-mode dual
max-ephones 265
max-dn 600
ip source-address 10.190.0.1 port 2000
timeouts interdigit 5
system message "GlobalDial Unavailable"
cnf-file location flash:
time-zone 48
date-format dd-mm-yy
voicemail 080758831#
max-conferences 8 gain -6
moh "xmas_jazz.wav"
multicast moh 239.1.1.1 port 16384 route 192.168.1.1
transfer-system full-consult
transfer-pattern 0.T
secondary-dialtone 0
create cnf-files version-stamp 7960 Nov 27 2013 18:23:59

I was thinking to put a few more multicast IP,. but it only allow you to put one ( while the cucm set the IP address as increment)

OC-MHO-VG-SRST(config)#telephony-service
OC-MHO-VG-SRST(config-telephony)#multi
OC-MHO-VG-SRST(config-telephony)#multicast ?
moh Set IP multicast address for use with music-on-hold from flash

OC-MHO-VG-SRST(config-telephony)#multicast moh ?
A.B.C.D Define music-on-hold IP multicast address from flash

OC-MHO-VG-SRST(config-telephony)#multicast moh 239.1.1.2 ?
port Define media port for multicast moh

OC-MHO-VG-SRST(config-telephony)#multicast moh 239.1.1.2

Aaron Harrison · ‎12-19-2014

Hi Rachel

Where in the post above I have put 'port incremental' - that means port, not IP.

Each stream from CUCM will use a different IP with your settings of 'increment IP', meaning G711, G729, etc streams of the same audio source will use different IPs, and appear random.

Use 'port' increment as instructed.

Aaron

Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate!