That's only for BLF (dialog/info presence), nothing to do with the calling.

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
  https://www.opensips-solutions.com
OpenSIPS Summit 27-30 Sept 2022, Athens
  https://www.opensips.org/events/Summit-2022Athens/

On 10/10/22 10:13 PM, Bela H wrote:

Or is the dialoginfo_set_branch_callee(callee) function the key here?

*From: *Bela H <mailto:hob...@hotmail.com>
*Sent: *Tuesday, 11 October 2022 08:09
*To: *Bogdan-Andrei Iancu <mailto:bog...@opensips.org>; OpenSIPS users mailling list <mailto:users@lists.opensips.org>
*Subject: *Re: [OpenSIPS-Users] Request-Disposition: no-fork

Thanks Bogdan!

However, I am talking about serial forking, call forwarding busy/no answer scenario.

Is there a way to avoid that in the cfg without messing up with the to tags?

How do I achieve “proxy to only a single address ("no-fork")”?

According to fork-directive in https://www.rfc-editor.org/rfc/rfc3841#section-9.1.

Cheers,

Bela

*From: *Bogdan-Andrei Iancu <mailto:bog...@opensips.org>
*Sent: *Tuesday, 11 October 2022 01:49
*To: *OpenSIPS users mailling list <mailto:users@lists.opensips.org>; Bela H <mailto:hob...@hotmail.com>
*Subject: *Re: [OpenSIPS-Users] Request-Disposition: no-fork

Hi Bela,

What you are trying to do (messing with the TO-tags) is a bad idea, as you will be breaking the upstream parallel forking.

If the GW does not support forking, what you can do is to avoid doing parallel forking in your cfg (like when routing to users via lookup). You do not need any special support.

Best regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
   https://www.opensips-solutions.com  <https://www.opensips-solutions.com>
OpenSIPS Summit 27-30 Sept 2022, Athens
   https://www.opensips.org/events/Summit-2022Athens/  
<https://www.opensips.org/events/Summit-2022Athens/>

On 9/29/22 7:10 AM, Bela H wrote:

    Hello,

    I have call forwarding busy/no answer scenario: A number is from a
    gateway, B and C numbers are our own subs.

    The gateway is sending us the INVITE message with
    “Request-Disposition: no-fork” header field.

    That means we must use one dialog for the mentioned scenario.

    Currently the To tag we are sending to the GW in the first 180
    ringing/181 Call is being forwarded messages are different to the
    To tag in the second 180 ringing and 200 OK (SDP).

    Gateway                  OpenSips

                  INVITE

    ------------------------------------------>

    100 GIVING IT A TRY

    <-- -----------------------------------------

          180 RINGING

    <- -------------------------------------------

    181 CALL IS BEING FORWARDED

    <- -------------------------------------------

          180 RINGING

    <- -------------------------------------------

          200 OK (SDP)

    <- -------------------------------------------

    What would be the easiest way from OpenSIPS to send the same To
    tag (it should be the same from the first 180 ringing through to
    the 200 OK) and using one dialog for this scenario?

    Cheers,

    Bela

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