[OpenSIPS-Users] Remove to-tag from 1XX provisional responses

[Newlin, Ben]

Not only that, but provisional responses (except 100 Trying) are required to have a To tag [1]. So you would likely run into issues with UAs if you start returning messages without them.

You could just drop the provisional replies, but you may run into issues with timeouts in that case as user A won’t receive any provisional responses until answer.

Your best bet would be to use the B2BUA module and let OpenSIPS rewrite the tags for you so that user A only ever sees the tags coming from OpenSIPS, never the ones from the gateways.

[1] https://tools.ietf.org/html/rfc3261#section-8.2.6.2

Ben Newlin

From: <users-bounces at lists.opensips.org> on behalf of Alex Balashov <abalashov at evaristesys.com>
Reply-To: OpenSIPS users mailling list <users at lists.opensips.org>
Date: Friday, October 21, 2016 at 5:55 PM
To: "users at lists.opensips.org" <users at lists.opensips.org>
Subject: Re: [OpenSIPS-Users] Remove to-tag from 1XX provisional responses

Conceptually, To tags are governed by the UAs, not the proxy, so, like
most fundamental elements of SIP messages, the proxy has no business
removing them. :-)

On 10/21/2016 05:41 PM, Daniel Zanutti wrote:

Hi

Short:
Do you guys see any problem on removing the to-tag of all 1XX messages?


Long description:
If user A calls number 2222. Opensips forward to gateway B which replies
with 183 session progress, then refuses with 503.

Opensips then call gateway C which replies with 183 then 200 OK.

User A now is using to-tag from gateway A and not from gateway B and I
have an unexpected result on subsequent messages.

Do you guys see any problem on removing the to-tag of all 1XX messages?

Thanks


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Alex Balashov | Principal | Evariste Systems LLC

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