Hairpin

In VoIP, hairpin (or hairpining) is the means to send a call back in the direction that it came from. If a call cannot be routed over IP to a gateway that is closer to the target telephone, the call typically is sent back out the local zone the same way from which it came.

Vangie Beal
Vangie Beal
Vangie Beal is a freelance business and technology writer covering Internet technologies and online business since the late '90s.

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