The rules of engagement when it comes to ring back

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Here are the rules of engagement when it comes to ring back:

  • If Lync receives a SIP 180 Ringing message, it signals to the Lync client to play a ringing tone. These tones are not transmitted from the callee to the caller in RTP media packets; the ringing tone is generated locally by the Lync client
  • If a SIP 180 Ringing response is not received, never generate local ringing
  • If a SIP 180 Ringing is received but there are no incoming media packets, generate local ringing
  • If a SIP 180 Ringing has been received and there are incoming media packets, play them and do not generate local ringing

Great article here if you want to learn more.

 

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