<p>Interesting.<br>
You might want to consider paying some expert for consulting ?</p>
<p>Mitul</p>
<div class="gmail_quote">On Jun 22, 2013 7:21 PM, "Nick Khamis" <<a href="mailto:symack@gmail.com">symack@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hello Everyone,<br>
<br>
We are currently having talks with various service providers, and<br>
trying to determine what the best way is to interconnect in order to<br>
have access to the PSTN network. As you know there are two ways of<br>
doing this:<br>
<br>
Traditional PRI: Have trunks grouped into a transport layer such as<br>
OC3/12. With DIDs attached to the group. As you many know, this<br>
approach would also require a POP near the CO of the exchange we want<br>
to service etc.. We could also have the service provider backhaul some<br>
of the NXX in areas we do not have a POP, to a location near by.<br>
<br>
SIP Trunking: SIP traffic coming through the end of transport layer<br>
such as OC3 or ethernet connection directly connected to the service<br>
provider, with DID that can come from anywhere. No need for a POP in<br>
Chicago, for example, when we are located in Kansas.<br>
<br>
The benefits of one over the other are known, and not the topic of<br>
this message. What we are trying to determine are:<br>
<br>
When talking market price, a "virtual PRI/SIP Trunk" interconnect<br>
costs about 500-550 per 24 channel virtual pri. This compared to a<br>
true "ISDN/PRI" which can costs between "200-500" dollars depending<br>
who you talk to. We also have to take into consideration the hardware<br>
needed for either setup i.e.:<br>
<br>
* Option 1: SIP Proxy<br>
* Option 2: media gatweays, multiplexers, media server....<br>
<br>
Even though it was natural to talk about "pricing", this is still not<br>
what we are interested in knowing. What we are interested in finding<br>
out is:<br>
<br>
* How are service providers that offer "virtual pris" interconnected<br>
with their suppliers? I would imagine that some (non-CLECS), are<br>
renting a connection from the LECs, and grouping PRI/ISDN trunks<br>
(option 2). And others (CLECS), have a A-Link/ISUP trunk interconnect<br>
to the CO.<br>
- Which brings up a second question. How does a PRI trunk group<br>
differ from an ISUP<br>
trunk. I don't know much about and ISUP trunks and would *really*<br>
appreciate having<br>
someone educate us on (i) the concept, (ii) what type of equipment<br>
would be needed,<br>
(iii) how it differs from ISDN trunk groups. (iv) is it only<br>
available for LECS<br>
<br>
I do have more questions, however for the sake of brevity will stop<br>
right here. And before anyone asks the "it depends what you want to<br>
do", I will mention that we are trying to establish an interconnection<br>
that will sustain 2016 channels or 84 T1s, and 5000 DIDs. We are not<br>
trying to become a CLEC however, still feel that option 2 would be the<br>
better choice for reasons covered here, and some that are left<br>
implicit (i.e, quality, reliability of managing our own<br>
networks......).<br>
<br>
Your insights are greatly appreciated!<br>
<br>
Nick.<br>
<br>
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</blockquote></div>