scope:

This Recommendation applies to signal processing functions that are intended for use in a communication link between terminal devices through network connections.

Examples of signal processing functions are echo cancellers, acoustic echo control, automatic level control and noise reduction. Communication networks include GSTN, IP networks, wireless mobile networks and any combination of them.

This Recommendation defines a generic framework for a coordination mechanism intended to minimize undesirable interactions of signal processing functions present on bearer paths of a communication link. The goal of this Recommendation is to provide a mechanism that can be used to optimize the end-to-end voice quality.

The signal processing functions subject to coordination by using this Recommendation could be present in the terminal devices and/or the communication networks. The mechanism performing dynamic coordination of signal processing functions includes the following components: capability announcement, capability identification, capability interaction resolution and capability change.

This Recommendation does not define the protocol to implement the coordination mechanism, but rather defines all the elements and information to be exchanged in support of the coordination mechanism. The implementation aspects of this mechanism will be defined in other ITU-T Recommendations.