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SIP method ack

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Posted by , on November 20, 2003

SIP implements a three-way handshake.

  • The caller sends an INVITE
  • The callee sends an 200 OK to accept the call
  • The caller sends an ACK to indicate that the handshake is done and a call is going to be setup

If the first INVITE message includes a SDP call description, the 200OK includes the callee’s SDP.

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