I'm trying to configure the AAR Group and AAR CSS on a 2821 MGCP Gateway with 2 x VIC2-2BRI modules installed. Every time I try to add these parameters I get the following error message:
Update failed.  AAR Group OR AAR Calling Search Space can only be used for devices that support the AAR feature
CUCM Version is: 184.108.40.2060
G/W IOS is: advipsvcs 12.4-15.T
AAR is working for other sites with BRI's but they're setup as H.323, rather than migrate these MGCP sites I would like to understand why this isn't working and is there an alternative workround?