It’s happening almost daily now, it seems that randomly only one side of the call is connected, either we can hear the caller and they can’t hear us or we can’t hear the caller and they can hear us, sometimes when we pick up the caller is still getting the ringing tone or the “thank you for calling” message.
There are no obvious patterns in the issue, i.e. not restricted to certain numbers or regions.
It is critical that this is fixed as we are running a small call centre.
Cisco IP Phone 7940 / 7960