Cisco Cisco IOS Software Release 12.4(2)XB6

This feature is supported only on C5510 DSP-based platforms.

ISDN backhaul is not supported.

This feature does not support modem calls.

For platforms that support HDLC resources on the motherboard, the available on board HDLC 
resources are limited to 31 if all resources are not enabled.

The Cisco 2801 platform does not support full channelized data or full integrated data and voice over 
T1/E1 PRI interfaces. However, data back up through one PRI channel, or one group of PRI channels 
for data backup, is supported on this platform.

Only PPP with multilink is supported for multiple channels. HDLC is not supported for multiple 
channels.

You can either configure ds0-groups or pri-groups on one controller, but not both. You receive a 
message, as in the following example:

Router(config-controller)#ds0-group 19 timeslots 20 type e&m-imme$9 timeslots 20 type 

e&m-immediate-start 

%A pri-group was configured already. Please remove it to configure a ds0-group

The following calls are not preempted by a DDR call:

Calls from a T.37 store-and-forward off-ramp gateway

Incoming ISDN calls

This feature is not supported from a BRI interface.

The following dialer commands are not supported with the integrated data and voice feature: