Document Revision 4C Electra Elite IPK II
2 - 638 ISDN Compatibility
CO Line Service is not supported.
ISDN – PRI cannot be configured for CO Emulation
B-Channel to Trunk Association
When an Incoming ISDN-BRI/PRI call is received, the system assigns the lowest trunk
number of the ISDN circuit to the incoming call associated with the B-Channel. When an
Outgoing call is placed using the ISDN-PRI/BRI, the system assigns the Trunk and
B-Channel association according to the chart below. This is based on the Trunk-to-Trunk
Group and Trunk Group Priority assignment in (PRG 14-05-01).
Refer to the charts below for examples:
Incoming Call
Trunk
Number
B-Channel
Number
Station User 9 1
Talking on TK009 10 2
11 3
12 4
13 5
14 6
15 7
16 8
17 9
18 10
19 11
20 12
21 13
22 14
…31 …23 Incoming call from the
Network on Channel 23. In most
cases, the Network will control/select
the B-Channel used for an incoming call.
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