MusicClass not playing after the call is answered

Asterisk Asterisk Support
1

Hi Team,
I want to play customHold music when my call is answered then if that is put on hold then that custom music should play
for that case i have done some research that in asterisk 17.8 we have

moh_class  
Set(CHANNEL(Musicclass)  --> if have used this 
This only work if I set that variable on part A channel and if party b holds the call then music plays
but i want to set the music class when party B answered the call then if any call put on hold then music should played
but the problem is 
both are on diffrenet channel part A lets ex :: ASD34444000a channel 
and partyB answeredChannel ex: ASSS00000b
so the variable set on part b channel but doest work it plays default music on hold 
i want 
if party B answers the call the custom music on class should set there and then it should work 
this is the diaplan which was called when the call is answered
[macro-answered]
2

There is no Team. We are all individuals.

I’ve read this about three times and I still don’t understand the question.

It would help if re-edited it so that only the relevant parts were marked as pre-formatted.

I don’t understand what ASSS00000b is. It’s not an identifier that Asterisk itself would create, as those use hexadecimal numbers, separated from any user supplied or keyword parts.

I suspect that describing the sequences of actions by users on a pair of phones, and the expected behaviour would help. Obviously the way that the phones are connected, may also be relevant (analogue, SIP, etc.).