Asterisk sip allowguest
This setting determines if anonymous callers are permitted to place calls to Asterisk. This defaults to 'yes'.
You will need to either set the appropriate default context in the [general] section of sip.conf, or you can employ a domain= setting in which you specify the context that you want calls to this domain to be handled in the dialplan (extensions.conf).
In most cases of allowguest=yes you would also want to set 'nat=yes' in the [general] section of sip.conf since most Internet users are behind NAT/firewall.
Note: When compiled with OSP support (open settlement protocol, used for inter-carrier voice traffic) then allowguest can also be set to 'osp'.
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