A method and apparatus are disclosed for routing calls over an organization's private network of private branch exchanges. In particular, when a member of the organization (e.g., an employee, etc.) places a call from his or her affiliated off-premises telecommunications terminal (e.g., cell phone, etc.), the call is automatically routed to its destination through at least a portion of the private network of private branch exchanges when doing so reduces the cost of the call. In the illustrative embodiment, the call routing is performed automatically and transparently via software on the affiliated terminals (i.e., employees' cell phones) and on the organization's private branch exchanges.
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