<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>I’ll throw my two cents in as I’m in the process of moving to SIP. I have about 50 PRIs across the nation with an avg cost per channel of $24 and change. We are currently negotiating our SIP MSA and rates with different vendors. We are expecting to reduce our cost per channel to just under $20 and we’ll be reducing the total number of channels by 40%. In terms of 911, we use an E911 provider and we use SIP to route those calls as well. With regards to G.729 codec selection. I think AT&T has simply elected to only support G.729 for simplicity. Other providers do allow G.711 but I would consider G.729 as it circuits have to be sized to carry the traffic even in a DIA situation. Like others already said, using G.729 means less transcoding. If you are going SIP DIA, acquire Cisco Cube or some other SBC solution like ACME (awesome product).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Oh yeah, AT&T has already testified to congress that they will not be selling PRIs in 5-10 years and SIP will be the only business class phone service they will be selling. I expect other providers to follow suit. You can google AT&Ts testimony in congress, I found it in a couple different .pdf presentations AT&T submitted to congress. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I can’t wait to stop supporting TDM personally.<b><span style='font-size:10.0pt;color:gray'><o:p></o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>