Re: [Sip] PING/PONG

----- Original Message ----- 
From: "Christer Holmberg (JO/LMF)"
> But, we also have to remember, that eventhough PING would
> have a response (which CRLC does not have), due to the
> transcation timeout- and re-transmission timers it would
> still take a while (until the transcation expires) to
> figure out that the NAT binding has been closed.
>

With UDP, the PING will create a new NAT binding and the server can update
its mapping for the UA.

With TCP, if you want to be able to detect that the NAT binding is gone on
the order of a transaction timeout, you would need to send a PING every 32
seconds or so. Given that NAT bindings for TCP live longer than that, I
don't see what the CRLF buys you.

cheers,
(-:bob

Robert F. Penfield
Chief Software Architect
Acme Packet, Inc.
130 New Boston Street
Woburn, MA 01801
bpenfield@acmepacket.com

_______________________________________________
Sip mailing list  https://www1.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use sip-implementors@cs.columbia.edu for questions on current sip
Use sipping@ietf.org for new developments on the application of sip