IP address mask for SIP traffic

In a user/peer definition in sip.conf, you may limit SIP traffic to and from this peer to a certain IP or network

Syntax

  permit=<ipaddress>/<network mask>
  deny=<ipaddress>/<network mask>

Order Matters! - The last matching rule is the one used. If no rule matches, then the connection is permitted.

Examples:

 deny=192.168.40.38/255.255.255.255
Denies traffic from this IP address

 permit=192.168.40.0/255.255.255.0
Allows traffic from this network

 deny=0.0.0.0/0.0.0.0
 permit=216.207.245.47/255.255.255.255
Deny every address except for the only one allowed.

You may have multiple rules for masking traffic. Rules are processed from the first to the last.

See also

• sip.conf: insecure=

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• Asterisk | Asterisk SIP Channels