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

[David Knell]

For what it's worth, BT's IP Exchange (VoIP interconnect) platform comes
with a caveat in its documentation that incompatible peers will not be
able to call each other, and suggests that everyone offer G.711(A) (in
our case, as we're not in the USA) as a lowest common denominator.

It may well be that L3 ought to be doing something similar.

--Dave

> These are both SIP trunks..on our BW platforms - call never goes out to PSTN
> 
> Cust 1 PBX is G729 only, Cust 2 PBX is G711 only...
> 
> Ujjval Karihaloo
> VP Voice Engineering
> IP Phone: +13032428610
> E-Fax: +17202391690
> 
> SimpleSignal Inc.
> 88 Inverness Circle East
> Suite K105
> Englewood, CO  80112
> 
> 
> 
> -----Original Message-----
> From: Hiers, David [mailto:David_Hiers at adp.com] 
> Sent: Tuesday, August 10, 2010 12:17 PM
> To: Ujjval Karihaloo; voiceops at voiceops.org
> Subject: RE: The peer of my peer is my peer?
> 
> So... one of the parties is a BW subscriber on your system?
> 
> 
> 
> David Hiers
> 
> CCIE (R/S, V), CISSP
> ADP Dealer Services
> 2525 SW 1st Ave.
> Suite 300W
> Portland, OR 97201
> o: 503-205-4467
> f: 503-402-3277
> 
> 
> -----Original Message-----
> From: Ujjval Karihaloo [mailto:ujjval at simplesignal.com] 
> Sent: Tuesday, August 10, 2010 10:27 AM
> To: Hiers, David; voiceops at voiceops.org
> Subject: RE: The peer of my peer is my peer?
> 
> Followup - 
> 
>  
> 
> Just seeing this with one customer now...
> 
>  
> 
> Our settings on Viper don't allow L3 to transcode L3 Cust to L3 Cust ....However, I can get it to work on Vector.
> 
>  
> 
> Any idea whats the best way ifpossible to hairpin the calls back to PSTN for this kind of scenario on Broadsoft?
> 
>  
> 
> From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org] On Behalf Of Hiers, David
> Sent: Tuesday, July 13, 2010 2:39 PM
> To: voiceops at voiceops.org
> Subject: [VoiceOps] The peer of my peer is my peer?
> 
>  
> 
> 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
> 
> CCIE (R/S, V), CISSP
> ADP Dealer Services
> 2525 SW 1st Ave.
> Suite 300W
> Portland, OR 97201
> o: 503-205-4467
> f: 503-402-3277
> 
>  
> 
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-- 
David Knell, Director, 3C Limited
T: +44 20 3298 2000
E: dave at 3c.co.uk
W: http://www.3c.co.uk