Terms Used in Codec Policies

Understand the following definitions for terms used in codec policies.

DTMF Codecs—Uncompressed codecs capable of properly transmitting a DTMF waveform. Supported codecs: PCMU and PCMA.

FAX Codecs—Uncompressed codecs capable of properly transmitting a T.30 waveform. Supported codecs: PCMU and PCMA.

Signaling Codecs—Non-audio codecs interleaved into a media stream, but cannot be used on their own. Supported Codecs: Telephone-event and Comfort Noise (CN).

Comfort Noise Codecs—Interoperable codecs used to transcode silence to Comfort Noise on the E-SBC. Supported codecs: PCMA, PCMU, and G.726.

Disable an m= line in an SDP message—Use to set the m= line port to 0 (RFC 3264).

Enable an m= line in an SDP message—Use to set the m= line port to non-0 (RFC 3264). The m= line’s mode attribute (sendrecv/inactive/rtcponly, etc) is not considered.