[sr-dev] git:3.3: New Option: "x" for automatic bridging between IPv4 and IPv6.

[Carsten Bock]

Hi Juha,

sorry for the late answer. I've discussed this with the SEMS guys (we
were discussing about IPv4/IPv6 interworking), who discussed this with
Alfred E. Heggestad.
We did agree, that SDP would probably never contain both IPv4 or IPv6
addresses. RFC 6157 (https://tools.ietf.org/html/rfc6157, "IPv6
Transition in the Session Initiation Protocol (SIP)") also recommends
using ICE for SIP-IPv4/IPv6 dual-stack.
If we follow this RFC and typical UA's, we will always have
"either/or" rather than "and".
However, i've never seen any dual-stack SIP-Endpoints so far..

Kind regards,
Carsten

2012/11/2 Juha Heinanen <jh at tutpro.com>:
> admin at sip-router.org writes:
>
>> New Option: "x" for automatic bridging between IPv4 and IPv6.
>> Based on the following assumption: "i" is the IPv4 interface
>> and "e" is the IPv6 interface on the RTPProxy (tested with both
>> RTPProxy and Sipwise's ngcp-mediaproxy-ng).
>>
>> Mechanism is as follows:
>> - IP in SDP is IPv4: Do bridging "ie"
>> - IP in SDP is IPv6: Do bridging "ei"
>
> i don't know how this would help.  proxy gets invite that includes ipv4
> or ipv6 address in sdp and $rd is domain name.  what should proxy config
> do?
>
> in such situations perhaps rtpproxy should ADD its own address of
> different protocol in sdp and then when reply comes, un-arm rtpproxy if
> reply included address of original protocol.
>
> i don't know if legacy UAs can deal with two ip addresses in sdp.  if
> not, this whole bridging stuff is wasted effort.
>
> -- juha
>
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