8440 Line Unregistered and One-sided Dropouts [ Edited ]

[PAC_Admin]

Two issues:

First Issue:

It seems to happen at random, but sometimes the phone will stop connecting to the SIP server with a "Line Unregistered" warning. If you turn the phone off and back on it is fine. Also, if it sits for a while (10 - 20 minutes) it will start working again. It still shows that it is connected to my network.

Second Issue:

Once again, this seems to happen at random. If one person calls anyone (externally or internally), that person will not be able to hear the person they called but the person they called will be able to hear them. If the call is disconnected and retried, it usually works. If not, the phone must be rebooted before it works OK.

I currently have 31 8440 phones connected to my network. I am using View Certified Cisco 1142 Access points. I have an Avaya SCS500 SipX based call server (version 3.8). I also have an AudioCodes Mediant 1000 running version 5.00A.042.004. Phones are running version 4.0.0.20561 of the UC software.

[SteffenBaierUK]

Hello PAC_Admin, 

welcome to the Polycom community. 

I would refer you to your reseller as without Wireshark Trace , Log Files and Configuration Files it is hard to verify your setup.

Usually setting the sip log level to 3 or 2 could give you an indication in the Log files but this case is best worked through the official support channels.

Best Regards

Steffen Baier

[PAC_Admin]

I think I may have found the solution for both issues. After reading this, I discovered that the version of the software my Access Points have is prior to the recommended version detailed in the guide. I put these lines into my configuration file on my provisioning server:

<device device.set = "1"
device.wifi.dot11n.enabled.set = "1"
device.wifi.dot11n.enabled = "0">
</device>

Before this I was experiencing dropouts occurring anywhere from just a few seconds to 6 minutes. I now have uninterrupted phone call for 10+ minutes.

[MattV]

Pac_Admin,

Thank you for the heads-up.

Please always use the Polycom VIEW Certified Products Guide to verify not only the AP Model, WLAN Controller model, QoS and Security used, but also the specific Software versions that were used to successfully test and VIEW certify the respective combination of Infrastructure and handsets.

The individual Configuration Guides will further detail settings etc. to be used, making sure you have a well working installation and positive experience.