Your SIP platform and the far-end network need a common audio codec for a voice call to connect with media.
cloudnumbering relays the Session Description Protocol (SDP) offer between the call legs. It does not provide codec transcoding, so your SIP platform must accept a codec offered by the far-end network or transcode it itself. Codecs are passed through unchanged, but the media transport profile can be converted between RTP and SRTP between the legs.
Troubleshooting
The call connects but has no audio
Compare the SDP offer and answer in your SIP trace. Confirm that both contain a common codec and that your firewall permits the negotiated media path.
My preferred codec is not offered
Configure your SIP platform with another codec present in the offer, or transcode the media on your own platform.
I need a guaranteed codec list
Codec availability depends on the far-end network offer. Do not assume that a codec observed on one call will be offered on every route.
Comments
0 comments
Article is closed for comments.