This document specifies Real-time Transport Protocol (RTP) payload
formats to be used for the Enhanced Variable Rate Narrowband-Wideband
Codec (EVRC-NW). Three media type registrations are included for EVRC-
NW RTP payload formats. In addition, a file format is specified for
transport of EVRC-NW speech data in storage mode applications such as
email.

The present disclosure provides systems and methods for dynamically signaling encoder capabilities of vocoders of corresponding communication nodes. In one embodiment, during a call between a first communication node and a second communication node, a control node (e.g., base station controller or mobile switching center) for the first communication node sends capability information for a voice encoder of a vocoder of the first communication node to a control node for the second communication node. As a result, the second communication node is enabled to select and request a preferred encoder mode for the voice encoder of the vocoder of the first communication node based on the capabilities of the voice encoder of the vocoder of the first communication node.

RTP Payload Format for the Enhanced Variable Rate Narrowband-Wideband Codec (EVRC-NW)

Citations

Mechanism for dynamic signaling of encoder capabilities

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