I tried to use this isdn bind-l3 ccm-manager command in our voice gw (2811, IOS 12.4(15)T8 with VWIC2-2MFT-T1/E1), but under "interface Serial0/0/0:15" I could not issue it. Only "isdn bind-l3 q931" is the available option. The gateway not yet under CM conrol nor the "ccm-manager config" was issued.
I also checked IOS and feature (MGCP PRI Backhaul and PRI/Q.931 Signaling Backhaul) compatibility with Software Advisor, but it tells this IOS is fine (min support: 12.4(2)T3). Do someone have any idea why this command could not be used?