Re: [Sip] Keep draft and manipulation of Via header on-stack

[Bob Penfield <BPenfield at acmepacket.com>]

Modifying the Via is not without precedent.

  RFC 3261 requires the "received=" parameter be added.

And modifying the value of a parameter in the Via is also  not without precedent.

  RFC 3581 defines this behavior for the "rport" parameter.

   When a server compliant to this specification (which can be a proxy
   or UAS) receives a request, it examines the topmost Via header field
   value.  If this Via header field value contains an "rport" parameter
   with no value, it MUST set the value of the parameter to the source
   port of the request.  This is analogous to the way in which a server
   will insert the "received" parameter into the topmost Via header
   field value.

cheers,
(-:bob

-----Original Message-----
From: sip-bounces at ietf.org [mailto:sip-bounces at ietf.org] On Behalf Of Dean Willis
Sent: Monday, May 12, 2008 1:22 PM
To: sip at ietf.org List
Subject: [Sip] Keep draft and manipulation of Via header on-stack

draft-holmberg-sip-keep-00 section 7 says:
When an edge proxy that supports the method defined in this
specification recieves a SIP REGISTER request which contains a "keep"
parameter in the topmost Via header the edge proxy MUST add a "yes"
value to the "keep" parameter. In addition the edge proxy MAY include
a Flow-Timer header field if the associated SIP REGISTER response.
I think this is the first time I've seen a specification that causes a
proxy to modify a Via that was already in the request.
So we really want to do this, or do we want the proxy to be adding its
own Via with "keep=yes"?

--
Dean
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_______________________________________________
Sip mailing list  https://www.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use sip-implementors at cs.columbia.edu for questions on current sip
Use sipping at ietf.org for new developments on the application of sip