Choose PRI line based on calling number

[Yangjp715]

Hi Folks,

I meet a problem, for outgoing calls, does Cisco ISR support to choose PRI line based on calling number if customer has over 2 PRIs?

dial-peer voice 911 pots

translation-profile outgoing callingnumber1 

destination-pattern 911

no digit-strip

port 0/0/0:23

DID 1 

Translation-profile callingnumber1 means If assigned extensions dial 911, their calling number will translate to DID 1, and these extension will take the first PRI dedicatedly.

dial-peer voice 911 pots

translation-profile outgoing callingnumber2

destination-pattern 911

no digit-strip

port 0/0/1:23

Translation-profile callingnumber2 means If other assigned extensions dial 911, their calling number will translate to DID 2-5, and these extension will take the second PRI dedicatedly.

Does it works?

Thanks.

[Aaron Harrison · Accepted solution]

Hi 

Not with the config you have proposed...

Essentially what you need to do is control the routing in/out with prefixes. Configure your phone system to send the called number with a prefix that matches a dial-peer that is linked to a specific PRI.

E.g User A dials 91234, CUCM sends 11191234. Gateway routes 11191234 to ISDN-1, stripping  the leading digits

User B dials 91234, CUCM sends 222912345. Gateway routes 22291234 to ISDN-2, stripping the leading digits.

Aaron

[Yangjp715]

Hi Aaron,

How to associate the assigned user and the route pattern on CUCM?

Thanks a lot.

[Aaron Harrison]

Hi

You would assign a different CSS to each group. That CSS would allow the user to dial normally (e.g. 9 for outside) but each CSS would have unique Route Patterns that insert the prefix.

Aaron

[Yangjp715]

Thannks Aaron,

The customer has a h.323 gateway. There is only one route group on CUCM, How to choose the assigned PRI based on the configuration of route list?

[Aaron Harrison · Accepted solution]

Hi 

It's the same idea - you can use the same RL/RGs if need be. it's just careful dial plan design...

You need a CSS for each user group.

Each CSS has unique route patterns that match normal-dialled numbers, and insert a prefix.

When that prefix is received on the gateway, the gateway will route differently based on the prefix, and strip the prefix appropriately for the PSTN.

Aaron

[Yangjp715]

You are awesome.

About incoming calls, Telco will route the calls to assigned PRI based on destination number. Do i need to configure dial-peer based on answer address?

Thanks.

[Shadi Shami]

guys, why you do not simply configure dial-peers with answer-address?

[Chandra Sekar]

Hello Aaron,

I am having the similar requirement - along with that. Customer also wanted PRI Redundancy.

Means - if one of the PRI goes down - the call has to be routed through other PRI.

Any ideas to achieve this request.

-Chandra.

[Shadi Shami]

Hello,

Yes it;s possible, using (answer-address) to match calls based on originating calling number instead of (destination-pattern).

More info can be found in this link

Thank you,

Shadi