Two of such phones cannot make and receive calls. I have rebooted and restarted the phones but to no avail. Pls what do you suggest?
Hello dmkpuje,
welcome to the Polycom Community.
It is always useful to state if this is a new install or a new issue.
The community's VoIP => FAQ <= contains this post here:
Oct 7, 2011 Question: How can I check out the Registration Status of my Phone?
Resolution: Please check => here <=
Above explains how the display of the phone can be used to determine the registration status of the phone.
You can then in addition follow this:
Jan 19, 2012 Question: How to troubleshoot Polycom VoIP related Issues?
Resolution: Please check => here <=
Above explains how to use wireshark or the phone's logs to troubleshoot VoIP related issues.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services