Re: TRIP deployment?

* Andy Davidson · * Tue Nov 25 03:22:44 2008

On 24 Nov 2008, at 15:55, Jeremy Jackson wrote:
On Mon, 2008-11-24 at 15:20 +0000, [email protected] wrote:

I'm not sure if this is the right mailing list for this question:
how widely is TRIP (Telephone Routing over IP [RFC3219]) deployed /
used in current networks?

http://xconnect.net/ is the big ENUM provider, I think that's the
method that has gained popularity for VoIP Peering on the signaling
end. TRIP sounds like it would be useful for finding QoS routes for
media streams.

Hi, Jeremy, Cayle, All --
I am regularly involved with SIP interconnect. There are a number of
providers of similar Federated/All-call-query-ENUM Multilateral
Islands, but they do not befit the bilateral interconnect model which
most people involved with voice interconnect need to follow, so that
they can manage quality and the commercial properties of individual
prefixes. *Some* of the island methods I have seen, perform signaling
arbitration and media transcoding so that all parties on the island
can communicate with all other parties, which is worrying to me as one
of the benefits of end-to-end VoIP is the preservation of wideband
audio codecs and new signaling features across the call path, compared
with lowest-common-denominator call routing (just like TDM paths in
the middle).
I discussed this with Richard Shockey last year and proposed to him an
out-of-band, trip-like gateway protocol that could express prefixes
along with all relevant technical and commercial properties between
telecoms peers. If the commercial and technical properties fit the
requirements of the peer, then the prefix is appended to the dialplan
of the peer (be it via a local ENUM zone or some other prefix/call
routing method). The point is that the protocol to communicate
prefixes and attributes needs to be call routing agnostic. I did some
work on this protocol, but don't feel ready to take the document to
the relevant working groups at this stage, but would welcome feedback
on it from anyone here who is involved with voice interconnect.
This is a bit layer 7ish, so the thread is possibly reaching a
conclusion on list, but I really hope it continues off-list.
best wishes
Andy