A SIP enabled softswitch typically uses a separate media server for music on hold (MoH). Different extensions or...
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SIP addresses are be assigned for different MoH sources on the media server.
Take the example where two parties (A and B) are talking on SIP phones. When party A presses the HOLD button, a SIP re-INVITE message is sent to the softswitch indicating that the call should be placed on hold (e.g., party B should hear music). The softswitch then sends a re-INVITE message to party B which indicates it should establish a new call with the MoH source. So, SIP is used to set up the call so the audio stream for the MoH can be played.
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