How to update polycom cx700 with lync basic to firmware 4.0.7577.4451.

Frank kortenray
Occasional Visitor

How to update polycom cx700 with lync basic to firmware 4.0.7577.4451.

I have purchased 5 polycom cx700 ip phones.  In our office we use Microsoft 365 office premium which includes Lync basic.


After connecting the cx700 with an usb cable to my computer i get the message that i shout use Lync to login.

When i sign in to the cx700 with Lync basic. The cx700 signs in and automatically signs out again.


After contact with Microsoft who checked everything the conclusion is that i needed a different version of the firmware. Firmware version that we had on Polycom Cx700 was 4.0.7577.463. Firmware version supported for Lync online on Polycom Cx700 is 4.0.7577.4451.


How can I update my firmware if I cannot use my Lync account?

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Polycom Employee & Community Manager

Re: How to update polycom cx700 with lync basic to firmware 4.0.7577.4451.

Hello Frank kortenray,

Polycom and other manufacturers produce these optimized for Microsoft® Lync® devices after a reference design and the embedded OS running on the phones is provided, supported and maintained by our partner Microsoft®.

Based on the design a LYNC or OCS server is required to update these units to a later Version than the factory delivered version. I am not aware of any other method on doing this rather than via for example setting up a local LYNC server.


You therefore may want to reach out to the Microsoft® community and / or Microsoft® support directly instead as this is the most direct and efficient path.

Please try here


Best Regards

Steffen Baier


If official support is required please check how to phone or open a case here

The title Poly Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. All posts and words are my own & do not represent the views of Employer.


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