[SR-Users] [kamailio/kamailio] SIP Preconditions Settings?

Henning Westerholt hw at skalatan.de
Mon Oct 4 17:17:30 CEST 2021


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.



Henning Westerholt – https://skalatan.de/blog/
Kamailio services – https://gilawa.com<https://gilawa.com/>

From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Luis Joel Borrego Soto
Sent: Friday, October 1, 2021 3:06 PM
To: sr-users at 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?


Joel Borrego (joel.borrego)
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