Is public-unknown-numbering to force oubound calls to show a specific DID on caller ID?

[SurferdudeHB]

I'm reading up on public-unknown-numbering and I'm a little confused. What is the main purpose of this feature?
Is it used mainly for a extension/range to show a specific DID numbers? Can you also force calls to specific trunk via public-unknown-numbering?

 

[SurferdudeHB]

I have public-unknown-numbering showing the following

ext Len Ext Code Trk Grp CPN Total CPN Len
10 555 20-60 7

This entry has no CPN, what does it mean?

 

[kyle555]

That means that for extensions of 10 digits in length, beginning with 555, when going out trunk groups 20 thru 60 on calls designated with public numbering, will send a total CPN length of 7 digits being the last 7 digits of their extension

If I had all of the 555-444-1000-1999, and extensions numbered 1000-1999, I could have extn length 4, code 1, trunk blank (to mean all of them), total CPN 10, and insert 555-444 and that 1 line would let extension 1000-1999 pass their DID out as caller ID.

 

[DAVIDPAYNE]

One of the usage would be if you had agents that did not have DID numbers or you wanted the person being call by a group of agent to only call back on a single 8xx number, etc.
And no, you can not restrict the Trunk group a call will make using public-unknown, you would use ARS,and route tables for that.