Configuring chan_sip for IPv6
Mostly you can use IPv6 addresses where you would have otherwise used IPv4 addresses within sip.conf. The sip.conf.sample provides several examples of how to use the various options with IPv6 addresses. We'll provide a few examples here as well.
Binding to a specific IPv6 interface
Binding to all available IPv6 interfaces (wildcard)
You can specify a port number by wrapping the address in square brackets and using a colon delimiter.
Other options such as "outboundproxy" or "permit" can use IPv6 addresses the same as in the above examples.