<div>here is my limited understanding..</div>
<div> </div>
<div>1) sip / cube trunk is certainly looks promising , however , when you build a business case , make sure you add up any wan bw upgrade costs to accommodate x number of concurrent g711 calls for example. with all overhead , some telcos recommend 100k for a g711 call , so you got to budget 500k for rtp streams straight away on the same wan pipe , where your data apps will flow. so , the costs savings of not buying e1 or t1 trunk & not buying e1 or t1 controller cards on the voice gw can easily disappear , if you do maths for sip trunk wan bw upgrade.</div>
<div> </div>
<div>2) secondly , I gather they still have some having issues , even though theoretically , t.38 should work well on this trunk. so you got to talk with telco closely with their own offerings. in a worst case scenario , you can still run some vg based faxing or even direct pstn if you few fax machines on a given site.</div>
<div> </div>
<div>3) watch out issues with sip profiles , which are essentially like voice translation rules on h323 gw, where you match & replace digits. depending upon telco , you got to send your ani with the realm name , rather than cube's ip address.</div>
<div> </div>
<div>4) depending upon flow around or flow through deployment , you need to configure mtp at ccm.</div>
<div> </div>
<div>5) also , some times i have seen issues where sip trunk in ccm pointing to the loop int of cube. it got fixed when i changed to its wan interface at one of my cube cut overs.</div>
<div> </div>
<div>finally , my biggest concern is the number portability of pstn & isdn in to sip platform , which i gather is still an issue with some of the telcos around the world.</div>
<div> </div>
<div>also do not forget to configure the wan qos on 5060 port for sip traffic when you role out a cube on production network.</div>
<div> </div>
<div>other than that , i reckon sip cube trunks are very valid alternative to $$ expensive pri trunks.</div>
<div> </div>
<div>tony</div>
<div> </div>
<div> </div>
<div><br><br> </div>
<div class="gmail_quote">On Wed, Feb 9, 2011 at 6:13 AM, Lisa Notarianni <span dir="ltr"><<a href="mailto:notariannil1@scranton.edu">notariannil1@scranton.edu</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
<div bgcolor="#ffffff" text="#000000">We currently utilize PRI trunks as fail over and backup. They connect to our 6509's.<br><br>Can anyone share their thoughts on SIP vs. PRI services. <br><br>Thanks,<br><br>Lisa<br>
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