Hi Implementors, In 3261 the re-transmission of INVITE is stopped by 1xx responses. So to stop the re-trnasmission of 200 OK, ACK is sent. (Albait it would be worth considering that ACK is used for a lot of other purposes.)
Further form 3261 only, it is clear that for other methods the request would be re-transmitted till a 200 is received. The entity sending a 200 OK would understand that the 200 has been successfully received if the Method is not re-transmitted again. My question is, Why at all a 3 way handshake is implimented for INVITE. And 100 trying is not restricted for any Method inside a dialog, so if a 100 Trying is issued for say UPDATE then why it is not the same case as of the Re-INVITE's arriving inside the same dialog. Thanks Abhishek. _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
