Any gotcha's with IPv6 and Asterisk v13?

Recently started testing Asterisk 13 with IPv6. So far everything seems to work. I can register an extension and do echo tests. Can make calls to IPv4 SIP trunk providers.

Anything I should be aware of?

Not particularly, just if you are using IPv6 in chan_pjsip you may want to wait until 13.13.0 or the next 14 release even. It has automatic dual stack support which doesn’t require any explicit configuration besides the transport. Older versions require you to specify in the configuration what to use for the SDP for media.

That’s good to know. Thanks for the info.