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

Hiers, David David_Hiers at adp.com
Tue Jul 13 16:38:50 EDT 2010

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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