Specifications

1-25
Catalyst 4224 Access Gateway Switch Software Configuration Guide
OL-2031-02
Chapter 1 Product Overview
Recommended Configurations
Step 4 Busy-out the time slots for which DSP resources could not be allocated. The
following sample configuration shows how to busy-out the time slots:
isdn service dsl 0 b_channel 17-24 state 2
Step 5 Use the show isdn service command to ensure that the channel is out-of-service.
The following sample configuration shows channels in 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
For incoming calls, only time slots 1-16 are used by the switch or PBX. North
American CO ISDN switches should support SERVICE/SERVCE ACK messages
for maintenance service of B-channels on the PRI span. For the CO switches that
do not support this service, you must ask the provider to busy-out the channels.
No Ring Back Tone Generated
When receiving or placing a call from an ISDN terminal (T1/E1 PRI), there is no
Progress IE in the setup. (Progress IE = 0.) The Catalyst 4224 does not generate
ringback when it receives an alert from Cisco CallManager. You can avoid this
situation and force the Catalyst 4224 to generate a ringback using the progress
indicator commands on the VoIP and POTS dial-peer statements. The following
sample configuration shows how to generate a ringback.
dial-peer voice 500 voip
destination-pattern 5...
progress_ind setup enable 3
session target ipv4:10.200.73.15
codec g711ulaw
dial-peer voice 300 pots
destination-pattern 1...