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Configuring Fractional T1 PRI ISDN
This release supports fractional T1 PRI ISDN on the following switch types:
•
•
•
To configure a fractional T1 for PRI ISDN, perform this procedure:
1.
2.
The DSP resources are not sufficient for the 24 timeslots, and you will receive a message
Note
indicating insufficient DSP resources. You need to configure the switch/PBX to make the
timeslots out-of-service. If you do not allocate 24 timeslots, a SERVICE message will not
be sent for the unallocated timeslots.
3.
4.
5.
OL-1798-01
DMS-100
5ESS
NI-1
Make sure the PRI VIC is configured last (after you configure all the VIC cards that require the DSP
resources).
Allocate all 24 timeslots for the PRI group. For example:
controller T1 1/0
framing esf
linecode b8zs
pri-group timeslots 1-24
Use the show voice dsp command to check how many channels could be allocated with the available
DSP resources. For example, in one case 16 timeslots could be allocated DSP resources.
Busy out the remaining timeslots for which the DSP resources could not be allocated. For example:
isdn service dsl 0 b_channel 17-24 state 2
Use the show isdn service to make sure the channel is out-of-service.
c4224#sh isdn ser
PRI Channel Statistics:
ISDN Se1/0:23, Channel [1-24]
Configured Isdn Interface (dsl) 0
Channel State (0=Idle 1=Proposed 2=Busy 3=Reserved 4=Restart
5=Maint_Pend)
Channel :
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4
State
:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3
Service State (0=Inservice 1=Maint 2=Outofservice)
Channel :
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4
State
:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 2 2 2 2 2 2
Now for any incoming call, only timeslots 1-16 will be used by the switch or the PBX.
Important Notes
Configuring Fractional T1 PRI ISDN
11
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