Hi, thanks for the advice. I will take a look at the code. I know, that " a=silenceSupp:off - - - -" is correct to the standards, i've just seen some buggy gateways which omitted the "- - - -" and made some Cisco-Gateways fail....
Carsten 2011/8/4 Stefan Sayer <[email protected]>: > Hi, > > o Carsten Bock on 08/04/2011 12:22 PM: >> >> Hi, >> >> short question: >> In the codecfilter.sbcprofile.conf-Example it says the following: >> >> # sdp_filter can be transparent,whitelist or blacklist >> # - leave empty (commented) for no touching SDP >> # - transparent does SDP reconstruction ('sanity check') >> # - whitelist and blacklist filter codec on both sides >> >> If set to transparent or whitelisting, is the SDP really >> re-constructed? I've noticed, that the session-name (s=) is passed >> through as well as the "o="-lines. > > yes, it is 'reconstructed', which means parsed by the SDP parser and then > rebuilt by SDP generator. The parser takes over both s and o SDP attributes. > >> What about other attributes? I wonder, if a gateway sends me buggy >> "a=silenceSupp:off - - - -" lines, is it passed through as well? I >> know some Cisco-Gateways will not connect that call, if the >> "a=silenceSupp:off" is incorrect according to the standards. > > hm, isn't this line: > a=silenceSupp:off - - - - > correct according to RFC3108? > > just fyi, if this needs to be sanitized in a way, the code would need to go > into SDPFilter.cpp (checking media.attributes). > >> By the way: Is there an easy way to add a "own" music-on-hold >> announcement, if a call through the SBC is put on hold? > > no, not yet. > > Stefan > >> >> Thanks, >> Carsten >> >> v=0. >> o=root 2018628531 2018628531 IN IP4 46.252.21.133. >> s=sipgate VoIP GW. >> c=IN IP4 46.252.21.133. >> t=0 0. >> m=audio 30218 RTP/AVP 8 0 3 127. >> a=rtpmap:8 PCMA/8000. >> a=rtpmap:0 PCMU/8000. >> a=rtpmap:3 GSM/8000. >> a=rtpmap:127 telephone-event/8000. >> a=fmtp:127 0-16. >> a=silenceSupp:off - - - -. >> a=ptime:20. >> a=sendrecv. >> a=nortpproxy:yes. >> >> > > > -- > frafos.com > -- Carsten Bock http://www.ng-voice.com mailto:[email protected] Schomburgstr. 80 22767 Hamburg Germany Mobile +49 179 2021244 Office +49 40 34927219 Fax +49 40 34927220 ~~~~~~~~~~~~~~~~~~~~ Upcoming Events: "10 years of SER" in Berlin on September 2nd, 2011 (@ Fraunhofer Institute, Berlin): http://sip-router.org/10-years-ser/ _______________________________________________ Sems mailing list [email protected] http://lists.iptel.org/mailman/listinfo/sems
