How can I stop ghost calls on my Polycom phone

https://www.yay.com/faq/voip-phones/polycom-ghost-calls/

Once you have the IP address, enter it into your browser with the https:// before the IP address - this is due to the certificates Polycom have on their phones. You'll need to trust the site to access it, this isn't harmful it's just the browser won't recognize the certificates used. You can then use the default password 456 to enter the admin control panel. 

Ghost calls for Polycom A

You'll need to export the configuration of the phone by going to Utilities > Import and Export Configuration. Go to Export Configuration, and export "All Configuration (except Device Settings)

From here you'll need to edit the config in a Text Editor (Mac) or Notepad (PC). You'll need to add the below 2 lines in specifically, right at the bottom of the page, before the "/>", as in the screenshot above. 

voIpProt.SIP.requestValidation.1.method="source"
voIpProt.SIP.requestValidation.1.request="INVITE"

Once you've done this, you'll be able to go back to the settings page, and upload the config file you amended. Once completed, you should find the ghost calls will stop affecting your Polycom!

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