DISABLE SDP MEDIA STREAMS - sr-users

29 May 2023

Hello kamailio community,

i know its an unusual query but i would like to know if there is a cleaner/proper.right
way to disable some  (or all) media streams in SDP.

i have come with a solution by sdpops module with subst_body function like this.

route[SDP_DISABLE_UNAUTHORIZED_MEDIA]{

      # disable text,media and video media streams
      subst_body('#^m=(video|text|audio)[ ]+[0-9/]+(.*)$#m=\1 0 \2#ig');

      # update originator ip address
      subst_body('#^o=([^ ]+)[ ]+([^ ]+)[ ]+([^ ]+)[ ]+([^ ]+)[ ]+([^ ]+)[ ]+([^
]+)$#o=\1 \2 \3 \4 \5 7.7.7.7#ig');
      #                         1                2                2              4 
              5          6
      #                        name           sid             snumber    network   
net-type    addr

      # update connection ip address
      subst_body('#^c=([^ ]+)[ ]+([^ ]+)[ ]+([^ ]+)$#c=\1 \2 7.7.7.7#ig');
      #                         1           2         3
      #                       network    net-type        addr

      #remove all media attributes
      sdp_remove_line_by_prefix("a=fmtp");
      sdp_remove_line_by_prefix("a=X-");
      sdp_remove_line_by_prefix("a=rtcp");
      sdp_remove_line_by_prefix("a=ssrc");
      sdp_remove_line_by_prefix("a=sendrecv");
      sdp_remove_line_by_prefix("a=sendonly");
      sdp_remove_line_by_prefix("a=recvonly");
      sdp_remove_line_by_prefix("a=inactive");  
      sdp_remove_line_by_prefix("b=");

}

is it the right way to do it. if not can someone provide me an alternative solution.

Thanks :)