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battleop
join:2005-09-28
00000

battleop to cramer

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to cramer

Re: [HELP] Need help determining errors

D4/B8ZS is rare but valid. I have a customer with about a dozen Voice T1s into ancient Mitel PBXs that are configured for D4/B8ZS. The circuit will work if your DF/EFS or AMI/B8ZS is in correct but you will end up with slips and strange, random trouble tickets that will make you pull your hair out.
meta
join:2004-12-27
00000

meta

Member

You would have to be going through one weird dacs to be running anything other than esf/b8zs on a data-only T1 in 2012. Please post some show controler t1 output for us to argue over =)

battleop
join:2005-09-28
00000

battleop

Member

These are circuits that are between an Adtran TA900 and the customer's PBX that replaced T1s that were once point to point T1s back into another carrier's 5ESS. It took some time to figure out this combination because the original phone vendor was no longer around and it took trial and error to discover this because the circuits would take errors and slips.

There is no reason why this would not work but there is no reason to do it unless there is some limitations on old equipment. Most of the PBX's that were installed with this configuration were put into service in the early 90's when PRIs and PRI cards were considerably more expensive than T1's. None of these PBX's can utilize Caller ID name even with a PRI and only a few of them will take Caller ID number using Feature Group D.