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