Hi, The behaviour of the sdpops module is not fully clear to me. Lets say in the INVITE contains in the m= line the payloads 0 99 but has no a= line for codec 0 / PCMU, Would the sdp_keep_codecs_by_name(“PCMU”) keep PCMU ? What about the case that the INVITE contains in the m=line only the payload 99 but shows an additional a=line for codec 0 / PCMU. Would the sdp_keep_codecs_by_name(“PCMU”) keep PCMU ? If yes, would the extra mtype parameter prevent that? e.g. sdp_keep_codecs_by_name(“PCMU”, mtype) What happens when several m= lines are present? Does sdp_keep_codecs_by_name consider all m=lines ? Are the treated separately? What happens to payloads which are not in the hard-coded list in sdpops_data.c ? Can they be used with the sdpops functions? Thanks for your hints. Best Gerry codecsmap_t sdpops_codecsmap_table[] = { { {"PCMU", 4}, {"0", 1} }, { {"GSM", 3}, {"3", 1} }, { {"G723", 4}, {"4", 1} }, { {"DVI4", 4}, {"5,6,16,17", 9} }, { {"LPC", 3}, {"7", 1} }, { {"PCMA", 4}, {"8", 1} }, { {"G722", 4}, {"9", 1} }, { {"L16", 3}, {"10,11", 5} }, { {"QCELP", 5}, {"12", 2} }, { {"CN", 2}, {"13", 5} }, { {"MPA", 3}, {"14", 2} }, { {"G728", 4}, {"15", 2} }, { {"G729", 4}, {"18", 2} }, { {0, 0}, {0, 0} } }; _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users