<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>This involves some very special messaging on the D channel.</div><div><br></div><div>Unless Cisco gateways support CCITT recommendation x.31 (virtual ISDN services essentially) their gateways won't support this.</div><div><br></div><div>I'm not aware of any devices except central office switches that support this type of operation.</div><div><br></div><div>I could be wrong on my memory of CCITT numbers also.<br><br>Sent from my iPhone</div><div><br>On Jan 28, 2015, at 4:31 PM, Justin Steinberg <<a href="mailto:jsteinberg@gmail.com">jsteinberg@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><p class="MsoNormal">Has anyone heard of splitting a single PRI into multiple
virtual trunk groups ? Not splitting the B channels into two
trunk groups, but creating a virtual trunk group on the D channel.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">When an outbound call is sent out the PRI, Cisco would
specify which virtual trunk group is being used and this would be sent in the D
Channel message.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">The use case is around E911/PSALI and DID screening
ranges. We want to have the telco remove the screening range, but they
said it isn’t possible with their CO switch since we are also using
E911/PSALI. The workaround the Telco provided was to create
two virtual trunk groups, one for E911/PSALI and one for no screening range.
911 calls would need to route out the PSALI virtual trunk group and all other
calls out the other virtual trunk group.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I’ve never heard of this in Cisco land. Any ideas?</p></div>
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