I have the DP-715 DECT cordless phone and we get a lot of spam/ghost calls. (3 calls every 20-30 minutes or so.)
Initially the calls were from 10/101/10000/5xxxx numbers and so using the advice of the internet I changed the local SIP port to 5081.
This solves that problem and prevented the calls for a while, but now we are getting calls from the caller ‘default’ followed by 1-2 further calls with id ‘External Caller’
I looked into solving the issue by setting the ‘Allow Incoming SIP Messages from SIP Proxy Only’ option but this stops the phone from being able to make and receive calls (as the option ‘Yes (no direct IP calling if Yes)’ would seem to suggest).
Does anyone know what the proxy option is for if it disables the phone or any other way of preventing ghost calls such as these?