[cisco-voip] Single PRI with multiple virtual trunk groups

[Walenta, Philip]

This involves some very special messaging on the D channel.

Unless Cisco gateways support CCITT recommendation x.31 (virtual ISDN services essentially) their gateways won't support this.

I'm not aware of any devices except central office switches that support this type of operation.

I could be wrong on my memory of CCITT numbers also.

Sent from my iPhone

On Jan 28, 2015, at 4:31 PM, Justin Steinberg <jsteinberg at gmail.com<mailto:jsteinberg at gmail.com>> wrote:

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.

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.

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.

I’ve never heard of this in Cisco land.  Any ideas?
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