IP Office systems support the G.722 64K codec for wide band audio. G.722 can be used with H.323 and SIP trunks. If can also be used with some SIP and H.323 IP telephones (see below). G.722 uses a higher speech sample rate (16KHz) than is used by most other audio codecs (8KHz).
G.722 is only supported by systems that are using IP500 VCM, IP500 VCM V2 and or IP500 Combination cards.
Avaya Phone Support
Use of G.722 is supported by the following Avaya phones on a IP Office system: 1100/1200 Series, 9600 Series, J100 Series, B179, B199.
Using the G.722 Codec
The G.722 codec is not available for use by default. If the codec is to be used, it must first be selected in the system's Available Codecs list (System | Codecs). The codec can then be used in the system's default codec preference list and or in the individual codec preferences of IP lines and extensions.
The method of codec selection for specific phones will depend on the phone type. Refer to the appropriate installation manual.
Conferencing
Where devices using G.722 are in a system conference, the system can attempt to ensures that the speech between devices using G.722 remains wide-band even if there are also narrow-band audio devices in the same conference. This is done if the system's High Quality Conferencing option is enabled (System | Telephony | Telephony).
Known Limitations
The following limitations apply to G.722 wide band audio operation:
Call recording uses G.711.
Page calls only use G.722 when all devices being paged can use G.722.
Fax is not supported in G.722, use G.711 or T38.
Soft tones provided by the system use G.711.
A maximum of 15 G.722 devices receiving wide-band audio are supported in conferences.
