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Alice calls Bob: (1) to (4)
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Bob, acting as a 3pcc -- third party call controller -- places
Alice on hold with music:
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Bob INVITEs a Music Server, without an SDP offer: (5)
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The Music Server replies with an SDP offer: (6)
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Bob takes the call with Alice off hold: (7) to (9)
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Bob acknowledges the Music Server with Alice's SDP answer: (10)
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The Music Server sends music to Alice
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Bob picks the call up from hold:
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Bob disconnects with the Music Server: (11) to (12)
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Bob takes the call with Alice off hold: (13) to (15)
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