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Multicast MoH issue in SRST/CME



I'm testing the MoH between IP Phones in the LAB (No PSTN available)

1. in normal mode, remote IP phone can get MoH from local SRST/CME router successfully

2. in SRST/CME mode, I hear ToH when press Hold button in remote IP Phone

CCM6.1.2 configuration


-g729 between HQ and remote office

-create a region to assign g711 between MoH server and remote office

-MoH server=enable multicast(, port 16384, increment=port numner, max hops=1)

SRST/CME configuration



ip multicast-routing


interface GigabitEthernet0/0

ip address


interface GigabitEthernet0/1

no ip address

duplex full

speed 100


interface GigabitEthernet0/1.22

encapsulation dot1Q 22

ip address


interface GigabitEthernet0/1.23

encapsulation dot1Q 23

ip address

ip helper-address

ip pim sparse-mode


ccm-manager mgcp

ccm-manager music-on-hold



mgcp call-agent service-type mgcp version 0.1




srst mode auto-provision none

srst dn template 1

srst dn line-mode dual

max-ephones 52

max-dn 192

ip source-address port 2000

max-redirect 20

system message Lost IP WAN, in SRST Mode!!

sdspfarm units 1

sdspfarm tag 1 conf

time-format 24

voicemail 3200

max-conferences 16 gain -6

call-forward pattern .T


multicast moh port 16384 route

transfer-system full-consult

transfer-pattern .T

secondary-dialtone 9



ephone-dn-template 1

call-forward busy 3200

call-forward noan 3200 timeout 12


ops1srst#sh ephone summary


Active MOH clients 0 (max 196), Media Clients 0, B-ACD Clients 0

File type AU Media_Payload_G711Ulaw64k 160 bytes

Moh multicast on port 16384 via

I exactly followed the CCO instruction but I hear ToH in SRST/CME mode. Advise please!!!

Thanks in advance,


Re: Multicast MoH issue in SRST/CME

put on the source address interface

h323 voip interface

h323 voip bind srr add

if didnt work make the wource interface as a loopback interface make it the source for voip and for sccp as well and add it to the moh multicast route

also try to remove the moh config and re put it again

good luck