• B-Channel to Trunk Association
When an Incoming ISDN-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, 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(23B):
Incoming Call
Trunk
Number
B-Channel
Number
Station User
Talking on TK009
9
10
11
12
13
14
15
16
17
18
19
20
21
22
...31
1
2
3
4
5
6
7
8
9
10
11
12
13
14
...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.
Outgoing Call
Trunk
Number
Trunk
Group
Trunk
Priority
B-Channel
Number
9
1
9
1
10
1
8
2
11
1
7
3
12
1
6
4
13
1
5
5
14
1
4
6
15
1
3
7
16
1
2
8
17
1
1
9
18
2
3
10
19
2
2
11
20 2
1
12
21
3
1
13
22
3
10
14
…31
3
...1
…23
Station user
places outgoing trunk
all by dialing Trunk
Access code. Outgoing
call is placed on the
associated B-Channel.
In addition to T1/PRI interface ETUs, PRI also requires a CSU/DSU Unit and interconnecting cables to
interface with the Telco.
SL1100
ISSUE 2.0
1-462
ISDN Compatibility
I
Summary of Contents for SL1100
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