Subject: 8. Can I use a digital (ISDN) phone and a Pipeline 50/50HX on the same BRI?

You need to be using an external NT1 (and the P-50-1SBRI model). If you have two SPIDs associated with your BRI, assign one to the P-50 and one to the ISDN phone. On a DMS-100 switch, this will leave you without the ability to use two channels.

As Bob Cameron wrote: 

> Actually, the DMS 100 can support 8 devices but only two can be circuit
> switched - the other 6 must be D Channel packet. Confusion arises
> because the DMS supports two logical terminals where a logical terminal
> equates to a Service Profile Identifier or B Channel. So if you have a
> data device which requires two SPIDS, you have two logical terminals
> and you can't add any more circuit switched devices. This is a real
> problem if you want to add an iISDN phone to the same line. The only
> answer is to power down the data device when you want to use the phone
> and unplug the phone when you want to use the both B Channels for 128
> KBPS data. The phone and one half of the data device would be
> programmed with the same SPID.

Joe Huber mentions that since software version 4.3C: 

> with an AT&T Custom switch, the Ascend can now utilize BOTH
> B channels on a single SPID and TEI. Leaving the other SPID and
> TEI for voice services in the ADAK or other device.

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