I recently installed 8 GXP 1630’s for a client. Ever since the install the customer has experienced intermittent issues with all of the phones where they try to make a call and the phone just appears to freeze and when a call is coming in they can’t answer the call, it just keeps ringing whether they lift the handset or press the answer key. This happens on all the 1630 phones on their domain. They also have one 21xx phone which has not had any of these issues. We have not experienced this with these phones any time previously. So far I have tried restoring the phones to default and provisioning them again and have replaced one phone completely but this has not made any difference.
I have video of the issues occurring if this would be of any help to diagnose.