Answer:
The correct answer to the following question is Hairpinning.
Step-by-step explanation:
Hairpinning is the returning message from one origin end-point and back in that direction from where it came, as the way to get it to the destination end-point.
All the conventional telephones systems use both digital and analog hairpinning connections.
In the VoIP (Voice over Internet Protocol), the hairpinning can be avoided and the two endpoints are connected after call has been initiated. This form of communication has following call setups which is called as shuffling.