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Wed 03 of Dec, 2008 [06:29 UTC]

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SIP method ack

Created by: oej,Last modification on Wed 26 of Apr, 2006 [21:04 UTC] by marvy
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.


Comments

Comments Filter
222

333but what if

by haldebei, Monday 28 of January, 2008 [14:51:23 UTC]
but what if the last Ack sent to "TO" field not to the "Contact" field as in the RFC 3261 ..then the call will not run normaly which is the case i face nowadays ...how can we solve it "from the B side or from the A side"?
222

333but what if

by haldebei, Monday 28 of January, 2008 [14:50:17 UTC]
but what if the last Ack sent to "TO" field not to the "Contact" field as in the RFC 3261 ..then the call will not run normaly which is the case i face nowadays ...how can we solve it "from the B side or from the A side"?
222

333Re:

by edokter, Wednesday 04 of January, 2006 [14:51:35 UTC]
Defenitely not! A 200 OK message is only sent when the call has been successfully established.

222

333

by tthorner, Friday 02 of December, 2005 [21:06:16 UTC]
Shouldn't this read:

- The caller sends and INVITE
- The callee sends a 200 OK to accept the call
- The caller sends and ACK to acknowledge the 200 OK and setup the call, thus completing the handshake