When a Vector Directory Number (VDN) directs an incoming call to a vector, the commands in the vector determine call routing and call treatment. Processing starts at the first step and proceeds through the vector steps. Processing skips empty steps and stops after execution of the last step.

One vector can direct the call to another vector or VDN, which in turn can direct the call to another vector. The call direction between vectors can continue up to a maximum of 10,000 vector steps for each call. When a call enters vector processing, a loop counter tracks the number of executed vector steps. If the loop counter exceeds 10,000, the system executes the stop command to terminate processing of the vector.