[VoiceOps] The peer of my peer is my peer?

Kristian Kielhofner kristian.kielhofner at gmail.com
Wed Jul 14 14:57:13 EDT 2010

  In an ideal world, yes.  In the real world it's difficult enough to
get predictable results negotiating ptime across two different Sonus

  I'm not beating up on Sonus here either.  Bodies like SIPConnect are
in existence because of the wide range of capability and
interpretation of spec currently present in the VoIP space.

  I don't want to seem like a pessimist but for the moment (and
foreseeable future) it is simply not acceptable to route production
traffic between two VoIP systems that have not undergone extensive
interop testing between one another.  I'm not just talking about
vendor certifications, either.  Almost every platform offers enough
deviation in software revision and configuration alone to warrant
testing between specific networks (and specific known configs at

  Even with adequate testing, how will my media be routed?  Between
endpoints over the internet?  Over some other layer 3 peering fabric?
What about potential issues in that transport?

  There needs to be something like an Acme to scrub the traffic
between two incompatible (or suspect) peers.  Simply using a SIP proxy
as demonstrated in the RFCs (Alice, meet Bob) is a recipe for disaster

On Wed, Jul 14, 2010 at 2:35 PM, Alex Balashov
<abalashov at evaristesys.com> wrote:
> One argument that's possible to make is that standardisation and
> commoditisation of all the relevant features has to some extent already--and
> will in the future further--reduce the need for this concern.
> In other words, it's more and more common to find CPE and network elements
> that support any conceivable ITU-T codec, any reasonable ptime, all forms of
> DTMF relay, etc.
> Obviously, we're not there yet.  But I would wager that those capabilities
> are going to converge faster than it would take for any of the big operators
> to overhaul their networks with outboard transcoding gear or additional
> feature cards in every POP and so on.
> --
> Alex Balashov - Principal
> Evariste Systems LLC
> 1170 Peachtree Street
> 12th Floor, Suite 1200
> Atlanta, GA 30309
> Tel: +1-678-954-0670
> Fax: +1-404-961-1892
> Web: http://www.evaristesys.com/
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Kristian Kielhofner

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