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Polycom CX700 cannot sign in with Lync 2013

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…