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Each IP phone maintains a registration to one of the many SIP registration points within the Sharpen network. Sharpen's SIP infrastructure is dynamic and redundant, which requires a non-static registration point for long term configuration. In this configuration, when a phone is booted, it uses the registration server defined in our distributed configuration file, and then registers to it. Should the registration point change, the file is updated and the phone is updated to then register to this new SIP server. Due to this design, accepting traffic from a known registration point has to be done in a dynamic manner. Polycom and Yealink phones have configuration options available which will only accept traffic from the currently registered to SIP server. Follow the instructions below for your respective device.
Polycom
Identify the IP address of your Polycom phone (Settings>Status>Network>TCP/IP Parameters)
In a web browser, enter https://x.x.x.x (eg.. https://10.0.5.68) to navigate to your web configuration for the phone
Depending on your browser, you will see a variation of a security warning. Choose to proceed to the web page
Authenticate using Admin as the user, and 6311 as the password
Choose Utilities>Import & Export configuration
Download the requestValidation_digest_INVITE.cfg file to import
Select Choose File and navigate to the downloaded file
Choose Import
Reboot phone
Yealink
Identify the IP address of your Polycom phone (Press OK button on the phone from the home screen)
In a web browser, enter https://x.x.x.x (eg.. https://10.0.5.68) to navigate to your web configuration for the phone
Depending on your browser, you will see a variation of a security warning. Choose to proceed to the web page
Authenticate using admin as the user, and admin as the password
Choose the Features tab
Choose General Information
Find the "Accept SIP Trust Server Only" parameter and set to Enabled
Select Confirm
Reboot phone
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