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Setting Up ISDN Service 2-15
* The directory number, circuit-switched voice, and circuit-switched voice limit parameters should be
set to 2 to allow both analog device ports to be used simultaneously. If these parameters are set
to 1, the ISDN line can only place or receive one call at a time.
ISDN Line
Configuration
Parameter
ISDN switch type
AT&T
5ESS
Custom
AT&T 5ESS
National ISDN-1
Northern
Telecom
DMS-100
National ISDN-1
Siemens
EWSD
National ISDN-1
Line type
Standard (2B+D)
line with
point-to-point
configuration
Standard (2B+D)
National ISDN-1
line
Standard (2B+D)
National ISDN-1
line
Standard (2B+D)
National ISDN-1
line
Line code
2B1Q (no NT1
required)
2B1Q (no NT1
required)
2B1Q (no NT1
required)
2B1Q (no NT1
required)
Interface type
U interface with an
RJ-45 jack
U interface with an
RJ-45 jack
U interface with an
RJ-45 jack
U interface with an
RJ-45 jack
Directory numbers 2
*
2
*
22
*
Maximum
terminals
1 1 NA NA
Maximum B
channels
2222
Circuit-switched
voice
2
*
2
*
NA NA
Circuit-switched
voice limit
2
*
2
*
NA Dynamic
Circuit-switched
voice channel
Any Any NA NA
Circuit-switched
data
2
*
2
*
NA NA
Circuit-switched
data and voice
NA NA NA Yes
Circuit-switched
data channel
Any Any NA NA