How Disable Sip quest in asterisk

If you have the “Asterisk SIP Settings” module installed, under “Advanced General Settings” there is an option labeled “Allow SIP Guests”. Set it to “No”.

You’ll stop seeing those attempts, but you won’t be able to receive any guest calls, either.

Optionally, you can set allowguest=no in sip_general_custom.conf if you’re not using the above module.

From the module’s help info: