Hi Iamnothere,
The extensions on all is like below;
CUCM: 7XXX
PBX1: 1XX , 2XX , 3XX , 4XX
PBX2: 5XX , 6XX
LDPLN and LROUTE configured like below;
on CUCM: 1XX , 2XX , 3XX , 4XX , 5XX , 6XX >> SIP Trunk to PBX1 ( Working OUT & IN )
on PBX1: 7XXX >> to CUCM 5XX, 6XX IP trunking to...