Yealink is supporting OPUS on several other models since firmware
V81:

Quote:
"We will support opus on the standard V81 of
SIP-T40P/T23P/T23G/T2 1(P) E2/T19(P) E2."

Source: http://forum.yealink.com/forum/showthread.php?tid=29650&pid=51262&mode=threaded

I can confirm OPUS implementation on the 'T21P E2' model.

--
EL

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