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

Paul Timmins paul at timmins.net
Tue Jul 13 17:04:32 EDT 2010

If any of my current suppliers did this, I'd scream bloody murder until
they fixed it or made it go away. If a provider lets people choose their
own settings, I fully expect them to transcode it for us. Anything less is
a bug.


> Every so often this issue comes up, and I want to get a read on it from
> other VOIP resellers...
> Consider a couple of unrelated VOIP resellers that peer with a carrier
> like L3.  Both can interop with L3 using strict SIP and RTP settings (max
> forwards, g729 only, 10ms ptime, whatever).  Both are free to select
> mutually incompatible settings.  For instance, reseller A can chose 729
> only, and reseller B can choose 711 only.  L3 will connect both to the
> PSTN without any trouble.
> Everything is good until they try to call each other.  Then the mutually
> incompatible settings will break calls or render predicted usage patterns
> invalid.  Sure, you're still signaling to a L3 SIP server, but some the
> information in the SIP/SDP packets that you receive is controlled by the
> other reseller.
> How often do you see problems related to the peer of your peer?
> David Hiers
> ADP Dealer Services
> 2525 SW 1st Ave.
> Suite 300W
> Portland, OR 97201
> o: 503-205-4467
> f: 503-402-3277
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