Hi Gaurav,
You could try adding it in CME like you do normally for any third party sip phones. Few things to note:
- For registering third party sip phones, mac-address is irrelevant. SO you can even give a dummy one
- Only thing it will use is the digest user id and password to register
- While configuring voice register pool in CME, do not configure phone type
For just registering a phone in CME, refer below:
http://www.uccollabing.com/2014/05/31/cisco-call-manager-express-cme-third-party-sip-phone-configuration/
Once you are done with this, provide the server IP, port and digest user credentials on the polycom phone web page.
HTH
Rajan
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