We have a SPA9000 setup as described here.
All is working fine with exception of the call pickup and call park features.
If we try to pick up a call ringing on another phone, the caller hears us but we don't hear anything from the caller. We found out, if we pick up the call, immediatly put it on hold and then resume the call all is good, communication works.
But this is an ugly workaround ... and in addition the caller hears the "music on hold" for 1 second or so :)
Did I miss something obvious in the SPA9k configuration? Firmware is the most recent (on the SPA9k as well as on the SPA922 phones). What should I look for in the configuration?
If you need more information, tell us how to retrieve it from the phones.