Conference with G.722 Codec

[jack_killian]

Hi!

We use OXO and want to make conferences with System Phones and Basic SIP Phones, using G.722 Codec.

Problem:
Both phones, system phone and Basic SIP Phone are working in "normal" calls with G.722, but if we try to make a conference out of an existing call, the codec switches to G.711 a-law, the codec change seems to come from the OXO.

Does anybody seen this problem and knows a solution to get G.722 codec working in conferences with OXO?

Thank you and greetings,
Jack

[fe80]

OXOs DSP chip type TMS320C6421 is unable to multiplex G.722. The system will negotiate always down to G.711 for conferences, barge-in, Music on hold or when a TDM phone is involved in the conversation.