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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If you are acting as an ITSP for Customer A and Customer B, I would
venture to say that it is your responsibility to normalize the media between
the two. Either proxying the rtp and transcoding on-net or hairpining to the
PSTN would both be acceptable.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Not doing so will result in inconsistent and unexpected behavior
for your customers, and that never makes anyone happy.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Geoff MINA <br>
--------------------------------- <br>
Chief Technical Officer</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Connect First Inc. <br>
P: 678.905.0671<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";
color:#1F497D'>T: 888.410.3071</span><span style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";
color:#1F497D'>F: 678.265.1158</span><span style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";
color:#1F497D'>E: <a href="mailto:gmina@connectfirst.com"><span
style='color:#1F497D'>gmina@connectfirst.com</span></a><br>
--------------------------------- <br>
</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><a href="http://www.connectfirst.com/"><span style='font-size:
7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>www.connectfirst.com</span></a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img border=0 width=169 height=19 id="Picture_x0020_1"
src="cid:image001.jpg@01CB22B3.8B1412B0" alt="cf_logo"><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
voiceops-bounces@voiceops.org [mailto:voiceops-bounces@voiceops.org] <b>On
Behalf Of </b>Mark Holloway<br>
<b>Sent:</b> Tuesday, July 13, 2010 4:58 PM<br>
<b>To:</b> Hiers, David<br>
<b>Cc:</b> voiceops@voiceops.org<br>
<b>Subject:</b> Re: [VoiceOps] The peer of my peer is my peer?<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I don't experience this with a provider like Level 3, but on
our network when one customer has an IP PBX with a SIP Trunk calling another
on-net customer with a SIP Trunk, the compatibility lies within those endpoints
playing nice with each other or else the call will fail. An example of
this is a customer we had as a field trial with a Toshiba CIX SIP Trunk using
G.729 and calling customers on the same SIP network with Adtran TA900's.
The CIX defaults to 40ms packetization with G.729 and the TA900 only
supports up to 30ms packetization. When the CIX customer would call the other
on-net numbers using TA900's they experienced one-way audio. We were able
to have the customer change the CIX to 20ms. It's a tricky area and I
think it's going to take several more years to iron out all the kinks.. There
is just too much interop testing to do between endpoints and providers that
unless there are standards set in place, I don't see how these sorts of issues
can be avoided 100%.<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<div>
<p class=MsoNormal>On Jul 13, 2010, at 1:38 PM, Hiers, David wrote:<o:p></o:p></p>
</div>
<p class=MsoNormal><br>
<br>
<o:p></o:p></p>
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<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Courier New"'>Every
so often this issue comes up, and I want to get a read on it from other VOIP
resellers...</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
</div>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Courier New"'> </span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Courier New"'>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.</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Courier New"'> </span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Courier New"'>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.</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
</div>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Courier New"'> </span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Courier New"'>How
often do you see problems related to the peer of your peer?</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
</div>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Courier New"'> </span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Courier New"'> </span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Courier New"'> </span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Courier New"'> </span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Courier New"'>David
Hiers<br>
<br>
CCIE (R/S, V), CISSP<br>
ADP Dealer Services<br>
2525 SW 1st Ave.<br>
Suite 300W<br>
Portland, OR 97201<br>
o: 503-205-4467<br>
f: 503-402-3277</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p>
</div>
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<div>
<p class=MsoNormal><span style='font-size:13.5pt;font-family:"Verdana","sans-serif"'><o:p> </o:p></span></p>
</div>
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style='font-size:13.5pt;font-family:"Verdana","sans-serif"'>
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