Re: [Sip] Doubt related to URI parameters in remote-URI.

To: "Vineet Gupta" <gupta.vineet at gmail.com>, <sip at ietf.org>

Subject: Re: [Sip] Doubt related to URI parameters in remote-URI.

From: "Rockson Li (zhengyli)" <zhengyli at cisco.com>

Date: Wed, 1 Oct 2008 15:04:36 +0800

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Thread-topic: [Sip] Doubt related to URI parameters in remote-URI.

Vineet,

If remote target URI has transport parameter, you should send it using the specified transport as per RFC3263.

The transport specified in Via sent-protocol transport should be set accordingly.

-Rockson

From: sip-bounces at ietf.org [mailto:sip-bounces at ietf.org] On Behalf Of Vineet Gupta
Sent: Wednesday, October 01, 2008 12:55 AM
To: sip at ietf.org
Subject: Re: [Sip] Doubt related to URI parameters in remote-URI.

Hi,

I understand that the below questions might appear naive. However, I would really appreciate opinion(s) on this, as this is required for my design.

Regards,

Vineet.

On Wed, Sep 24, 2008 at 7:48 PM, Vineet Gupta <gupta.vineet at gmail.com> wrote:

Hi,

I have very basic doubt related to URI parameters present in remote-contact URI (i.e. top-most Route URI or Remote Contact URI).

Case 1: The remote-URI contains URI parameters like transport=TCP and comp=sigcomp once INVITE dialog is established.

a) Is it mandatory for all the requests within the dialog to have transport=TCP and comp=sigcomp in the via header, there forcing compression and TCP transport for any connection within the dialog.

b) Can I send some request within the same dialog by retaining these parameter in the request-URI, but not them copying them onto the via header, thereby sending the request uncompressed and on UDP.

Case 2: The remote-URI does not contain any URI parameters.

a) Can any request within the dialog be sent with any parameters like transport=tcp;comp=sigcomp by putting them in via header irrespective of the way first request within the dialog (Ofcourse, keeping the capabilities of remote in mind) ?

In general, do the parameters in the remote URI have any binding on requests within the dialog?

Regards,

Vineet.

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