[asterisk-users] no audio both ways with ipv6

Antony Stone Antony.Stone at asterisk.open.source.it
Thu Oct 14 14:21:22 CDT 2021

On Thursday 14 October 2021 at 19:22:00, hw wrote:

> Hi,
> when asterisk registers with the VOIP provider via ipv6 and when
> local phones don't work with ipv6 but only with ipv4, am I to
> expect issues?

Do a SIP packet capture and see what the SDP in the INVITE is telling each end 
to expect from the other.

> I'm receiving incoming calls via the provider, asterisk correctly
> dials the phone where the calls are suposed to go to, the phone
> rings --- and when I pick it up, there is no audio in either direction.

Sounds like the setup is trying to do direct media - which obviously cannot 
work between an IPv4-only phone and an IPv6-only provider.

Make sure Asterisk remains in the audio path and it should "almost transcode" 
for you.

I have audio working over just such an arrangement (in my case, an IPv4-only 
provider, and phones connected via IPv6) without problems.


The difference between theory and practice is that in theory there is no 
difference, whereas in practice there is.

                                                   Please reply to the list;
                                                         please *don't* CC me.

More information about the asterisk-users mailing list