I've heard reference to this security issue in the past but have just gone
and read it for the first time, Section 9.3 right?  I'm not sure I
completely understand it.  Are you saying that another program can hijack
the connection once the legitimate SIP user is not present on the connection
anymore?  Would not the legitimate user have torn down the TCP connection
when it exited?  Wouldn't the TCP connection require authentication when it
was reestablished?  My apologies for my lack of understanding.

Thanks,
FM



-----Original Message-----
From: Vijay K. Gurbani [mailto:[EMAIL PROTECTED] 
Sent: Wednesday, April 18, 2007 12:03 PM
To: jiang mingda
Cc: [email protected]
Subject: Re: [Sip] sip tcp connection

jiang mingda wrote:
> Hi Folks, I have a question about sip over TCP. How many connections
> should be established between two sip servers/proxies? Shall I create
> only one tcp connection between them?

You cannot use one connection for bi-directional requests because
of the security risk identified in Section 9 of connect-reuse
(http://tools.ietf.org/html/draft-ietf-sip-connect-reuse-07).



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