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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>There are actually quite a few, however most have caveats or
special functions that cause issues when directly connected to
CallManager. <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'>For instance, some only provide DTMF inband, which CallManager
does not support. You have to use an IP2IP Gateway (SBC) with DSPs to
convert in-band DTMF to RFC2833. Some only support G711 for all calls,
some require multiple sip realms per SIP line (which Cisco currently only
supports one at this point).<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'>The biggest issue is with quality concerns. You have no
control once it leaves your network. However, if you use TWC (or a few
other sparse ISPs) you can get SLAs for voice quality if you use their SIP
offering. <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'>IMHO, use SIP trunks only if your ISP can provide the
service. Or, use someone like Broadvox who will let you “test drive”
before you buy.<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>
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<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"'>
cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] <b>On
Behalf Of </b>SHAM SHARMA<br>
<b>Sent:</b> Tuesday, January 22, 2008 7:58 PM<br>
<b>To:</b> keli@carocomp.ro<br>
<b>Cc:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> Re: [cisco-voip] SIP vs PRI PSTN<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'>not many service providers
support SIP yet ... SIP is future<o:p></o:p></p>
<div>
<p class=MsoNormal>On Jan 22, 2008 5:31 PM, <<a
href="mailto:keli@carocomp.ro">keli@carocomp.ro</a>> wrote:<o:p></o:p></p>
<p class=MsoNormal>Although I must admit I probably don't understand this
question (SIP<br>
for PSTN? Isn't that a contradiction in terms? :P ) my two cents (if <br>
we're talking about SIP as in VoIP protocol):<br>
<br>
You're free from quite a lot of expensive hardware (no gateway, no<br>
E1/T1 card, no DSPs) and also, even a *lot* of bandwidth can be<br>
cheaper that the monthly rates of an E1 PRI (well, at least this seems <br>
to be the case around here). Adding new PRI lines adds to costs almost<br>
in a linear fashion (hardware has to be bought for each line just as<br>
well), while bandwidth comes at significant discounts in large<br>
quantities. <br>
<br>
Though that's just my theory, since I myself don't really see this<br>
"trend" happening much. So far PRI is way more reliable as a<br>
technology to be easily replaced by SIP trunks... (again, this is just <br>
my point of view, my circumstances etc.)<br>
<br>
Zoltan<br>
<br>
Quoting Lelio Fulgenzi <<a href="mailto:lelio@uoguelph.ca">lelio@uoguelph.ca</a>>:<br>
<br>
> Is there a fundamental reason users are going from PRI to SIP for <br>
> the PSTN connections? Is there a cost savings realized somewhere -<br>
> either hard or soft?<br>
><br>
> I wouldn't mind hearing from the group.<br>
><br>
> Lelio<br>
>
--------------------------------------------------------------------------------
<br>
> Lelio Fulgenzi, B.A.<br>
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ <br>
> "Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo
buffalo." WJR<br>
<br>
<br>
<br>
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