Hi

customer want to use a specific announcement when hold activated on certain calls.
Is there any method to select custom music source/announcement when holding the call?

They are using following for regular hold:

HoldCall holdCall = new HoldCall();
holdCall.setCallToBeHeld(connectionID);

Communication Manager has a "Music on Hold" feature which plays music or possibly an announcement to callers who are on hold. However, I don't know if it is possible to give different treatments to different callers.

Failing that, and assuming the phone on hold is not a local extension, I think your options are quite limited.

One possibility is to write a DMCC application that acts as a station (registered in Main dependency mode). When this application detects an incoming call, it will play an announcement. You can then conference/transfer the call to this DMCC station.

Martin