currently deploying cme (aslo act as cube) with sip phone then connect to itsp sip trunk. topology as below:
ITSP --- (sip trunk) --- CME (CUBE) ---(register using sip)--- ip phones
call from itsp to ip phone and ip phone to itsp already running well.
problem with pickup feature from itsp.
if i call from internal extension to other extension then pickup running well.
if i call from itsp to internal extension (already set up DID) then pickup from other ip phone (within same pickup group) then call connected but no audio on both way. call still connect until one of party hang up the call.
already do some test, i call from itsp to internal extension, then pickup from other ip phone, call connect with no audio, then i "hold" the call from ip phone, then i resume the call, call connect with both audio.
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