Cisco Cisco IOS Software Release 12.2(8)YN

The following section lists the new hardware and software features supported by the Cisco ICS 7750, 
beginning with Cisco IOS software Release 12.2(8)YN.

Cisco IOS Release 12.2(8)YN on the Cisco ICS 7750 supports an MRP with an eight-port FXO card 
(MRP3-8FXOM1), as described below.

The Cisco ICS 7750 now supports an MRP with eight FXO-M1 ports (MRP3-8FXOM1), which you can 
use to connect to PBXs or key systems and to provide off-premise connections in the U.S., Canada and 
other countries. FXO-M1 is an enhancement of FXO with battery reversal and Caller ID features. Like 
the MRP3-8FXS, the MRP3-8FXOM1 also includes an open slot (slot 1) that accepts all VICs, WICs, 
and VWICs that are supported on the Cisco ICS 7750.

You can use H.323 with the Caller ID and battery reversal answer supervision features on the 
MRP3-8FXOM1. Media Gateway Control Protocol (MGCP) on the MRP3-8FXOM1 is supported, but 
not with Caller ID or battery reversal detection.

Cisco IOS Release 12.2(8)YN on the Cisco ICS 7750 supports the following new software features:

ISDN Non-Facility Associated Signaling (NFAS) enables a single D channel to control multiple Primary 
Rate Interfaces (PRIs). You can configure a backup D channel when the primary NFAS D channel fails. 
When you configure channelized T1 controllers for ISDN PRI, you need to configure only the NFAS 
primary D channel; its configuration is distributed to all the members of the associated NFAS group. 

By using a single D channel to control multiple PRIs, one extra channel on each interface is free to carry 
data traffic. Any hard failure of the primary D-signaling channel results in an immediate switchover to 
the backup D channel without disconnecting currently connected users.