Permit/Deny in sip.conf

Asterisk Asterisk Support
1

Can anybody enlighten me on how permit/deny exactly works in sip.conf?
Let’s take the permit example:
Specifying an IP address or subnet here will do what exactly:
Allow registration attempts only from said subnet?
Or
Prevent the device from sending and/or receiving traffic from IP addresses outside the permit range?

Thank you.

2

The source address for inbound INVITE, PUBLISH, OPTIONS, or REGISTER requests, but possibly not Re-INVITEs.

3

Is it possible to specify more IP address ranges in sip.conf under permit for an extension?
E.g. like this:
10.1.10.1/255.255.255.0
97.105.65.12/255.255.255.255

4

This might help you voip-info.org/wiki/view/Aste … -deny-mask