Multicast IP address keep changing on music on hold

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

Hi Rachel,
If the Increment Multicast on radio button is set to IP address, each MOH audio source and codec combination is multicast to different IP addresses but uses the same port number. If it is set to Port Number, each MOH audio source and codec combination is multicast to the same IP address but uses different destination port numbers.
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cusrst/admin/sccp_sip_srst/configuration/guide/SCCP_and_SIP_SRST_Admin_Guide/srst_appendix_b_.html#50022
HTH
Manish

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Multicast IP address keep changing on music on hold

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