Polycom CX700 cannot sign in with Lync 2013

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this is a fast published article

Warning:


DO NOT UPGRADE TANJAY/ CX700 TO THE LATEST FIRMWARE 4397/4411.

Your lync phone will be partially not able signing in with Lync 2013


more info an fix will be provided soon
Reference:
http://blog.schertz.name/2011/01/updating-lync-phone-edition-devices/


SOLUTION:
As I promised, here it come...

The bug is related to some undocumented processes for the so called old OCS Phone, which are the Tanjay/ cx700.

this login process and firmware update process is totally different from other Lync phones.
What do I have to do:

TANJAY:
Update the phone to the newest firmware, but be aware, the phone holds the version before 4397.

LYNC environment:

Phone Login:
-  the OCS Phone Edt, will NOT login via sip.<domain fqdn>, it will only us the sipinternal.<domain fqdn>.
Therefore ensure, the SIPINTERNAL FQDN is on the local certificate.
Our findings have shown, Tanjay will still query the sip.<domain fqdn>, will also make an TLS connection, but than it drops the communication. We don't know why. The response from PGI was, possible MS wanna get rid of this old OCS phones.

Phone Update:
- as we know, the update process is identified with ucupdate-r2.<domain fqdn> either via http or https, but here the old OCS environment only allowed https, this is now important to know for Tanjay firmware updates. It only can make updates via https. Therefor ensure you also put ucupdate-r2.<domain fqdn> as SAN into your local FE certificates too.


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