BACKGROUND:
I am migrating away from our Mitel SX-200 EL/ML PBX. I want to make the transition to the new PBX as smooth and quiet as possible.

CURRENT:
PSTN--T1-OLD MITEL

THE PLAN:
PSTN--PRI--NEW PBX--T1--OLD MITEL

-Then migrate off 1 extension at a time. (Setup forwarding on the old Mitel to the new PBX as I convert.)
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ISSUE:
I'm getting different answers to the same question and wanted some guru opinions.
(My Mitel guys are angry because I'm moving away from their product... They wont answer any of my questions - and they wonder why I'm leaving.)

INFO:
My current connection to my PBX is a T1.
VIA THE CARD:
T1 DS1 Trunk Card 9109-021-001-NA

LINK 01 (2x T1 DS1)
Bay 02 Slot 06
Bay 03 Slot 06
Line Coding = B8ZS
Framing = D4
(Can be changed to ESF)

LINK 02 (1x T1 DS1)
Bay 04 Slot 06
Line Coding = AMI&ZCS
(Can be AMI or B8ZS)
Framing = D4
(Can be changed to ESF)

QUESTIONS:
What is my ISDN based signaling protocol? Or maybe a menu where I can find it? (I.E. National ISDN 2, Nortel DMS100, Q.SIG?)

What kind of 'connection' are attached to these 'T1 lines from XO'? Are they fiber up to the Demarc and then turned into copper? Or are they fiber all the way up to the card. (9109-021-001-NA)

How can I find out how many outbound circuits we use on average?

Why do you think we are using different framing and coding?

Does the system support ‘auto detect’ for ISDN based signaling protocol?

Will need a crossover cable to attach my new PBX? (Or a special cable/pin outs?)

Thanks everyone in advance!