[VoiceOps] Voice peering
abalashov at evaristesys.com
Tue Jan 5 12:17:27 EST 2021
From my perspective as an implementor down in the weeds, ENUM is just a
failure-prone moving part and a source of unnecessary complexity at this
point. DNS is not a particularly good transport vehicle for data
queries. As far as I can tell, the industry went in that direction at
the time it did because it was the more performant option at the time,
which is a commentary on the sad state of SIP stacks early on.
Most folks realised a long time ago that SIP redirects are a lot more
flexible for data queries, and doesn't require a parallel infrastructure
of unrelated DNS componentry whose operational support demands
nonoverlapping technical competencies. ENUM as a routing query mechanism
has fallen into considerable neglect in some of the major softswitch &
SBC platforms, as far as I can tell. I distinctly remember severe
performance issues with ENUM a few years ago on one of the most
well-known SBC platforms (ahem); when the vendor was contacted about it,
the response was kind of, "Why would someone still use that?"
But, of course, that doesn't mean the peering provider landscape has
On 1/5/21 8:57 AM, Ross Tajvar wrote:
> Based on this presentation  from Comcast, they are interconnecting
> with their biggest voice peers via SIP rather than SS7. They appear to
> use ENUM for route selection. I'm sure others are doing this too, though
> I can't find anything public.
> I'm interested if anyone has more info on how this works. I'm guessing
> participants maintain their own private ENUM servers and just trust each
> other? As far as I know the only way to validate number ownership is via
> an LNP dip, which would be expensive to do for every call.
> I would like to be able to consume a service like that, at least in an
> outbound direction; as a small operator, I'm sure convincing large
> carriers to trust my ENUM server would be very difficult. But having a
> greater degree of interconnectedness (and mostly importantly avoiding
> TDM) seems like a good thing.
> Does anyone have experience with this sort of thing?
>  https://silo.tips/download/voice-peering-interworking-sip-and-bgp
> VoiceOps mailing list
> VoiceOps at voiceops.org
Alex Balashov | Principal | Evariste Systems LLC
Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
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