<html><head><base href="x-msg://31/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">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%.<div><div><br><div><br><div><div>On Jul 13, 2010, at 1:38 PM, Hiers, David wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Verdana; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div lang="EN-US" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-family: 'Courier New'; ">Every so often this issue comes up, and I want to get a read on it from other VOIP resellers...<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-family: 'Courier New'; "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="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.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-family: 'Courier New'; "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="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.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-family: 'Courier New'; "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-family: 'Courier New'; ">How often do you see problems related to the peer of your peer?<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-family: 'Courier New'; "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-family: 'Courier New'; "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-family: 'Courier New'; "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-family: 'Courier New'; "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="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<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div></div><div><div><br class="webkit-block-placeholder"></div><hr>This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. 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