On 1/4/17 7:42 AM, Vimal Tewari wrote:
RFC 3262 says (in the Introduction part):
PRACK is a normal SIP message, like BYE. As such, its own
reliability is ensured hop-by-hop through each stateful proxy. Also
like BYE, but unlike ACK, PRACK has its own response. *If this were
not the case, the PRACK message could not traverse proxy servers
compliant to RFC 2543 <https://tools.ietf.org/html/rfc2543> [4
<https://tools.ietf.org/html/rfc3262#ref-4>].*
I do not get the meaning of the last sentence. Can somebody please
elaborate this point?
The point is that proxies compliant to 2543 but not to 3262 will only
understand PRACK as an unknown message type. So they will process it as
a "normal" message.
Thanks,
Paul
_______________________________________________
Sip-implementors mailing list
Sip-implementors@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
