Hi,

You need to understand the principle and signalling flows for Preconditioning. There is no specific module for handling, en- or disabling Preconditioning in Kamailio. Kamailio gives you the tools to change signalling, headers or SDP content. You have to implement the changes yourself, what you want to achieve.

Thanks,
Carsten

Carsten Bock I CTO & Founder




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Luis Joel Borrego Soto <luisjoelborrego@gmail.com> schrieb am Do., 7. Okt. 2021, 08:07:
Hi Herning,

I didn't found any parameter related to SIP preconditions in that module.

But checking in the Kamailio, in the code we can see that there are some sentences trying to check "sip precondition" in the module xcap_server.c.

How can we ignore it ?

image.png

Br,

Joel Borregoo

On Mon, Oct 4, 2021 at 12:17 PM Henning Westerholt <hw@skalatan.de> wrote:

Hello,

 

Kamailio does not handle media on its own (besides rtpengine and other services).

 

If you want to modify the SDP inside your processed SIP messages, the “sdpops” module is one good option.

 

Cheers,

 

Henning

 

--

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com

 

From: sr-users <sr-users-bounces@lists.kamailio.org> On Behalf Of Luis Joel Borrego Soto
Sent: Friday, October 1, 2021 3:06 PM
To: sr-users@lists.kamailio.org
Subject: [SR-Users] [kamailio/kamailio] SIP Preconditions Settings?

 

Hi Team,

According with the RFC3312 (https://datatracker.ietf.org/doc/html/rfc3312)

The SDP parameters are the following

We define the following media level SDP attributes:

  current-status     =  "a=curr:" precondition-type
                        SP status-type SP direction-tag
  desired-status     =  "a=des:" precondition-type
                        SP strength-tag SP status-type
                        SP direction-tag
  confirm-status     =  "a=conf:" precondition-type
                        SP status-type SP direction-tag
  **precondition-type  =  "qos" | token
  strength-tag       =  ("mandatory" | "optional" | "none"
                     =  | "failure" | "unknown")**
  status-type        =  ("e2e" | "local" | "remote")
  direction-tag      =  ("none" | "send" | "recv" | "sendrecv")

Which one should be the equivalent in the Kamailio?, is the a specific module?

Br,

Joel Borrego (joel.borrego)

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