A guide on how to combat ghost calls on a Yealink Device
A ghost call is a call in which, when the recipient of the call answers, there is no one on the other end of the call, or you could receive calls from random 'short' phone numbers, with no one on the other line when you answer.
1. Change the local SIP port on the device:
Log into the phone's web interface (using IP number).
Select 'Settings' then select 'SIP'
Change 'Local Sip Port' and 'TLS SIP Port' : change from e.g. 5060 to 5160 and 5061 to 5161.
2. Check the firewall settings for the router:
Set your firewall to be more restrictive. Our advice is to permit all SIP / VoIP traffic from our platform. The IP range you should use is 195.35.114.0/23 (or 195.35.114.0/24 and 195.35.115.0/24). All other SIP / VoIP traffic you can block.
If the above does not work…
3. Extra settings on Yealinks:
Some information from the Yealink page
If it's a Yealink phone (there quite prone to receiving ghost calls) go to the Features tab and set Accept SIP Trust Server Only to 'Enabled' and Allow IP Call to 'Disabled'
Updates
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Still, want to speak to a colleague?
Can't quite figure it out or get it right? Call our Customer Happiness Team at 021 012 5000 or send an email to info@voys.co.za