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

["Jain, Rajnish (Rajnish)" <rajnishjain@lucent.com>]

James,

The option of adding a SIP header field seems to be more flexible. That way, 
when that header field is not present, the persistent connection is jointly 
owned by both UAs. And at their discretion they can close it. This allows us
to be backward compatible while enabling a new capability.

Thanks,
Rajnish 

-----Original Message-----
From: James Ford [mailto:james_s_ford@hotmail.com]
Sent: Tuesday, February 04, 2003 2:45 AM
To: sip@ietf.org
Subject: [Sip] Impossible to use real persistent connection with sip


Hi,
The SIP standard does not specify who is responsible for closing TCP 
connections. This means that both client and server transaction can close 
the connection. A reasonable implementation for a transaction will be to 
close any open connection (incoming or outgoing) before termination in order 
to free unused resources.
This behavior actually makes it impossible to count on a persistent 
connection.
For example, A UA that is always talking to the same destination using TLS 
will want to use one connection per day. This is impossible since the server 
might close the connection as soon as the first transaction terminates.

I can see several ways to solve this problem:
1.	Specify that the UA that opened the connection will be responsible for 
closing it.
2.	Add a header to sip requests that asks the server not to close the 
connection by itself.

What do you think?
James S Ford.






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_______________________________________________
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