When we double click on an extension within the call assistant or dial a phone number through Outlook, our phone will ring, we pick it up but then there is 'dead air' on the handset. The call is dialing and eventually will be picked up by the desired destination but while the phone is 'ringing' there is no ring in the handset? Sometimes you are not sure if the call is going through? The calls ring normal if you pickup the handset and dial a number with the keypad. We all use GrandStream GXP-2000 phones, running latest v8 build with 16 channels. We also use Cbeyond SIP connect service. What do yo think?