CM cluster 与远端站点的CM cluster 之间互拨，需要在2个Cluster 上创建Inter Cluster Trunking without Gatekeeper，具体如下：

-     Cisco Unified CM Administration -> Device -> Trunk -> Add New -> Trunk Type = “Inter-Cluster Trunk NON-Gatekeeper Controlled” -> Device Protocol = “Inter Cluster Protocol” -> Next -> Device Name “ICT-site-1” -> Device Pool -> Select “default”

-     Remote Cisco Unified Communications Manager Information -> Enter other side’s CUCM IP Address = 192.168.100.101 -> Save -> Reset.

Step 3: (Define Route Pattern)

-     Cisco Unified CM Administration -> Call Routing -> Route/Hunt -> Route Pattern -> Add New -> Route Pattern “9.XXXX” -> Select gateway = “ICT-site-1” -> Called Party Transformation = PreDot -> Save

Step 4: (CM2 Configuration)

-     Cisco Unified CM Administration -> Device -> Trunk -> Add New -> Trunk Type = “Inter-Cluster Trunk NON-Gatekeeper Controlled” -> Device Protocol = “Inter Cluster Protocol” -> Next -> Device Name “ICT-site-2” -> Device Pool -> Select “default”

-      Remote Cisco Unified Communications Manager Information -> Enter other side’s CUCM IP Address = 192.168.10.6 -> Save -> Reset.

Step 5: (Define Route Pattern)

Cisco Unified CM Administration -> Call Routing -> Route/Hunt -> Route Pattern -> Add New -> Route Pattern “9.XXXX” -> Select gateway = “ICT-site-2” -> Called Party Transformation = PreDot -> Save.