Adding a second PRI to Cisco H.323 Voice Gateway Router

I currently have 1 PRI configured on my voice gateway router.  We have had a few instances where we have had 20-21 simultaneous calls at a time, and as you know a single PRI only allows for 23 simultaneous calls.   I am looking to get another PRI from the same telco.  How does this work?  I have another T1(PRI) port on my router, which will be used to connect to the 2nd PRI, but how does it work on the Teclo side?  Do they  trunk the two PRI's together, so I can now have 46 simultaneous calls?  We are going to order another block of DID's with this new PRI as well.  So right now there are 39 numbers associated with the first T1, and I'm not sure yet how many we are going to get with the second block.    Does the telco tie these two PRI's together somehow, so both PRI's can share all the numbers?
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Unlike pots lined, pri's do not require additional did's, you can have a single incoming number and have 46 simulteneous calls on two T1's.

Depending on the provider, they will bond the two pri's (bonded T1) on your side, you would combine the two unto a
LAG group.
Single ip so long as one of the T's is up you would maintain the connection limited to 23 simulteneous calls...

Check with the provider how they are planning on this ...

ISP <=> feed <=> voice gateway on which t1 terminates and pbx?

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