scope:

The present document provides a study on the enhanced VoLTE performance (eVoLP). The study focuses on:

- Guidelines or requirements to ensure that MTSI clients send requests to adapt to robust modes of codec operation when necessary. This study may require investigating performance results for different conditions and adaptation procedures.

- Mechanisms to indicate at setup a terminal's ability to send adaptation triggers (e.g. to adapt to the most robust codec mode).

- Evaluate the impact of proprietary client implementations of Packet-Loss Concealment and Jitter Buffer Management (JBM) on having different Max PLR and potential mechanisms to indicate this to the network.