[Asterisk-Users] restricting SIP access to asterisk

[Rich Adamson]

> How do you set up Asterisk to allow SIP call requests from specific IP
> addresses?  We have no control over what account (From: header) is used.  We
> want to be able to allow calls based on the IP address the INVITE comes
> from, not the account.  Is there a way to do that?

Something like this in sip.conf?

[3000]
type=friend
canreinvite=no
dtmfmode=inband
context=from-sip
disallow=all
allow=ulaw
deny=0.0.0.0/0.0.0.0
permit=1.3.8.129/255.255.255.0

Adjust the parameters as needed to fit your environment / needs.