Kamailio-Asterisk real-time integration with Dynamic IP - sr-users

16 Aug 2015

All,
The Kamailio-Asterisk integration that is described here
asterisk:realtime:kamailio-4.0.x-asterisk-11.3.0-astdb [Asipto - SIP and VoIP Knowledge
Base Site]
is limited to Asterisk servers with a fixed IP address. The reason is that Kamailio
identifies and authorizes traffic from Asterisk based on the source IP address. Attached
is a patch to kamailio.cfg that adds support for dynamic Asterisk hosts. It introduces the
option to define a fully-qualified domain name instead of the IP address to identify the
Asterisk server. The host name can be dynamically updated to always point at the
(changing) IP address of the Asterisk server. Defining WITH_ASTERISK_FQDN enables the new
option.
When WITH_ASTERISK_FQDN is set, Kamailio will perform a DNS search on the host name in the
asterisk.bindhost variable. It will authorize incoming traffic if it originates from one
of the IP addresses the DNS lookup returns (and matches the asterisk.bindport variable as
before).
Furthermore, the patch introduce the option to automatically set the IP address of the
server that Kamailio is running on. This does away with the need to properly define
kamailio.bindip on every server that the configuration is running on. This option is
enabled by defining WITH_AUTOIP.
With the suggested changes I have been able to successfully run an Asterisk server in my
home, having a dynamic public IP address and connecting to the Kamailio proxy on a VPS
server with a static IP addres.
Please let me know if you have any comments or suggestions.
Kind regards,Rudy Eschauzier.

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