Messaging systems encode speech and TTY tones digitally for recording, transmission, and storage. Different encoding techniques are available depending on whether you want to maximize audio quality or storage efficiency. The G.711 format provides the highest audio quality especially when voice networks use multiple encodings and decodings. Avaya requires that you use the G.711 encoding format in Messaging systems that support TTY devices.
The G.711 encoding format uses a higher encoding rate than GSM. The G.711 encoding format therefore produces larger files and requires more storage space for messages. Messaging provides customers with adequate storage space for message playback and networking.