RE: [Sip] PING/PONG

Hi,

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

So will CRLF, won't it? The difference is that the UA will not be informed that the message has reached the destination (since there is no response), but the question is if we really would need that information for every keep-nat-binding message that we send (ie we use CRLF most of the time, and every now and then we use a SIP request to make sure that everything really works).

>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.

My point was that using PING you will not be able to detect problems immediately, since you will have to wait for the transaction timeout before you can determine that something is wrong. 

What I do NOT want to do is to send SIP requests too often, and therefor I was wondering if it would be possible to also use CRLF :)

Regards,

Christer Holmberg
Ericsson Finland

> 
> cheers,
> (-:bob
> 
> Robert F. Penfield
> Chief Software Architect
> Acme Packet, Inc.
> 130 New Boston Street
> Woburn, MA 01801
> bpenfield@acmepacket.com
> 
> 
> 

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