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Set up IP-PBX Realm of Branch.
Step2: Set up Trunk Account
In HQ, set up trunk account for Branch, so that Branch can register to HQ.
We suggest you to set up the DialPlan to [ext+allroute]. That means the call from Branch can use
all the resource of HQ.
In Branch, set up trunk account for HQ, so that HQ can register to Branch.