Background music during a call

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Hi all,

Continuing a previous post regarding background music during a call,
there is a strange miserable problem which I am unable to understand.
It works fine on some systems as I have tested it with sip and with
dahdi + pri signalling with digium hardware on one of my production
server, but when I use it on my other production server running digium
hardware + ss7 signalling, it often looses music voice when muting
/unmuting or decreasing / increasing volume. and music never comes
back. some times music stops automatically after a couple of seconds
and does not resume by any mean.

below is the email chain for background music. any help?