I have a location with (2) 3825 routers running IOS version 12.4.13d. There are two ISDN-PRI DMS-100 circuits in one router and a third in the second router. We are having issues with the location not getting incoming calls and the telco is telling me that the b-channels keep getting locked out. They have asked me to find out if I have b-channel service messaging enabled on my system. The DMS-100 switch is DMS-100 version LEC17 according to the telco. Has anyone seen this before? Any help would be appreciated.