Porting /some/ numbers from Level 3 PRI - what happens with the remaining numbers?

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Existing mostly-full PRI with LEvel3 / CenturyLink
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I need to port a few of those numbers into Ring Central.
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What impact will I see on the numbers being left at Level3? I'm hoping the PRI slots will either be left empty or backfilled by new numbers. 
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I"m terrified that when the porting numbers are removed, the remaining numbers will "slide down' to fill the empty space and all the user - Extension - port mappings in my Avaya IP500 will suddenly be connected to the wrong things.
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Not being a negotation for new or more expensive service, Level3/CenturyLInk is not worried about returning my calls.... :-/
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If I just go ahead and order the porting, what should I expect to see on the old account?
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VASILIADIS

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Posted 2 weeks ago

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FRANCIOSI

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It's been a few years since I've done any PRI work.  However, I doubt it's changed much.  A PRI trunk over a T1 is essentially 23 channeled lines delivered to your PBX (really 24 channels but one is typically reserved for signaling).  Each channel can handle traffic on any individual phone number.  Typically these phone numbers are DID's (Direct Inward Dial) and are not tied to any specific channel--any channel can use them.  When calls are dialed out or connected inward, the connection includes a header record that tells the PBX/Carrier what DID is being used. 

So when a DID is ported out of the Carrier's Service, it simple ceases to be an available phone number for call routing.  Porting a number out should have no affect on the Carrier side.  In rare instances they may fail to take a number out of their routing tables and will need contacted to make the update--this would only effect calls that are made inside their network and not intra-carrier calls. 

However your PBX will need to be programmed not to use those DID's.

Regarding CenturyLink/Level3, look on their web site for a number porting department.  These teams tend to be very responsive compared to contacting normal support or a sales rep.

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Jessica - Community Support, Official Rep

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Hi VASILIADIS,
I confirmed with our porting team, who advised that they port numbers off of PRI's all the time. They may get a rejection asking to clarify what to do with the remaining numbers and if you are porting the lead number and plan to keep the PRI in tact, you will need to designate a new lead number. Please submit your order and we will see what the losing carrier says.
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VASILIADIS

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Well, it looks like this is a moot point. What I thought was a rejection/closure for insufficient information on a previous porting attempt seems to have actually been processed. I've been stressing out over something that's already been completed. Even better, I've been stressed out and paranoid over something that's already completed AND had no adverse effects on call routing on the PBX that lost the numbers.

This is a great way to go into a long weekend. :-)