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PIN Authentication not show in CX5500

Occasional Contributor

PIN Authentication not show in CX5500

Hello all,


I have 2 new CX5500 run same version: 

UC Software Version 

Device Software Version 


I want to use PIN Authentication on Lync Signin page, but one device have it and the other have not.

Anyone know how to show the PIN Authentication in Authenticsation Type?



Polycom Employee & Community Manager

Re: PIN Authentication not show in CX5500

Hello vietht,

welcome to the Polycom Community.


Your Post was moved as it was not posted in the Skype for Business section.


Firstly you are using an outdated software. The latest Software for the CX is 1.3.0 so please ensure to upgrade your units.


In addition the phone will only display the PIN option if it received during bootup the Option 43. If it did not or on older versions it may show it but cannot utilize it.

The community's Skype for Business FAQ contains this post here:


Jul 11, 2014 Question: Why can we not sign into LYNC via Pin & Extension?

Resolution: Please verify that the phone has the => correct time <= and the Option 43 and Option 120 is setup in the DHCP scope as explained =>here <= or => here <= 

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

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The above is necessary in order to track issue internally within Polycom.

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