[SR-Users] Yet another IPv6 question related with rtpproxy ipv4/ipv6 bridging

[Miguel Baptista]

On 3/26/2013 5:33 PM, Daniel-Constantin Mierla wrote:
> Hello,
>
> On 3/25/13 9:23 AM, Miguel Baptista wrote:
>> Hello,
>>
>> I have been doing some tests with kamailio and IPv6.
>>
>> My initial setup was IPv6 only and now am I extending it to a
>> dual-stack environment. Well, and now I am starting to face some
>> (interesting) challenges.
>>
>> So, the first step in the dual-stack environment was to install RTP
>> Proxy and configured kamailio to use it.  With this setup, the UAs
>> locally registered were able to communicate with each-other no matter
>> with address family (IPv4/IPv6) they were using. So far so good.
>>
>> But now I want to extend my tests a bit more ... I want to
>> communicate with the "outside world" (using ENUM and domain based SIP
>> URIs). Do I have a way to know if the "destination" is IPv4 or IPv6?
>> Because I need that information in order to properly bridge the calls
>> on rtpproxy.
>>
>> I tried to use the onsend_route but it didn't work. I mean, I am able
>> to know if the "next-hop" is IPv6 or IPv4 but it seems that it is
>> "too late" to use rtpproxy. BTW ... I am assuming that if the
>> "next-hop" is IPv6 then the final user agent will also be IPv6 (the
>> same for IPv4)
>>
>> Should I use some other approach? For example, failure route instead?
>> Does anyone have a similiar setup? How are you solving this issue?
> I see few options here:
>
> - use two outbound proxies, one for IPv4 and one for IPv6 -- from your
> main proxy you can do parallel forking to the two edge proxies, one of
> the branches will fail if no device/server is listening on that
> protocol (or it will be dropped in onsend_route if after dns is not
> the expected IP version)
> - use lua or other embedded language to do dns lookup from config and
> decide in branch route what to do. Alternative is to execute external
> script or some web service
> - export to the config the internal dns lookup function so it will be
> done on demand and detect outgoing IP layer version (this requires c
> coding, perhaps not much -- preferable solution, because will remove
> it from my to-do)
> Cheers,
> Daniel
> -- 
>
Thanks for your feedback Daniel.
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