Re: [Sip] The fate of session timer?

[Jiri Kuthan <jiri@iptel.org>]

At 12:24 AM 11/12/2002, Jonathan Rosenberg wrote:
[...]
>I assert that session timer is really useful for one thing, which is to provide a means to cleanup old session state in UAs and proxies. 

I think a reasonable example of its use is firewall-control proxies
(unless they are considered a broken idea anyway). The SIP session 
timer mechanism can be used to propagate SIP "keep-alive" messages 
from UAs via proxy servers down to the firewalls (translated to some
MIDCOM keep-alives). In this way, the firewall-control proxies do not 
have to be session-stateful to keep firewall pinholes alive. Keeping 
them up is then UA responsibility. 

Simplification of the negotiation mechanisms seems like a good thing to me.

-Jiri


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