voip - Can a SIP call's media address changed mid-call? -


i referring c value of sdp header. enter image description here

is possible media stream address changes during call? , scenarios?

it may changed re-invite or update. example scenarios:

  • pabx system consisting of multiple machines decides route media through media endpoint because of e.g. high server load or other problem machine
  • after receiving fax cng, ced and/or modem preamble pabx passes call fax server
  • call passed specialized music-on-hold or ivr server

also, addresses advertised in sip headers or in sdp quite not matching real addresses used communication because of nat or misconfiguration - best results b2buas may ignore them.


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