Kamailio sdpops module consist of several useful functions for manipulating SDP on Proxy side such as sdp_keep_codecs_by_name() .

This function sdp_keep_codecs_by_name("PCMU,PCMA,GSM") finds codecs id [0,8,3] and if incoming packet consist of other than these codecs, they are removed ! For example, assume incoming packet SDP --> [8 0 3 9 101]   after applying this function 9 and 101 are removed and outgoing packet SDP consist only  PCMU,PCMA,GSM  [0,8,3].

This function does taking given codec precedence/priority into account. As you see above message SDP is 8 0 3, different priority than inputted 0 8 3. I need to change order of codecs too ! Would you help me to do it ? I couldn't find add operation on sdpops module

Regards,

Melek