RE: [Sip] Impossible to use real persistent connection with sip

["Christian Jansson" <christian.jansson@hotsip.com>]

Vijay K. Gurbani wrote:

<snip>

> Section 18 of rfc3261 correctly instructs implementors to 
> close connections after a certain time (64*T1).  

No, it does not. Section 18 does not say when to close sockets, but
rather that you should not close the socket to soon. So if you feel like
it, you could leave the connection open forever.


> It also 
> recognizes that two proxies in a peering relationship will 
> actually have two connections open towards each other (which 
> can be avoided).  And it also rightly defines "persistence" 
> to mean a transaction duration. rfc3261 must ensure that the 
> transactional integrity of SIP is preserved, and it does.

It says that it is good to keep the connection open during a
transaction, but it does not say that connections should be closed when
the transaction is terminated.

> 
> All that is being done now is an attempt to investigate an 
> extension that will enable "persistence" to mean some 
> duration longer than a transaction's lifetime.  Exactly how 
> long, how to negotiate it (or
> not) is what comes next.

Not needed. Close the socket when you have to, and probably it will be
more effective to keep it open for a while in case you need it again (as
Cullen Jennings wrote).

Christian Jansson
Hotsip
 
> 
> Cheers.
> 
> - vijay
> -- 
> Vijay K. Gurbani  vkg@{lucent.com,research.bell-labs.com,acm.org}
> Wireless Networks Group/Internet Software and Services
> Lucent Technologies/Bell Labs Innovations, 2000 Lucent Lane, Rm 6G-440
> Naperville, Illinois 60566     Voice: +1 630 224 0216
> 
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