What does a "SIP Fork" refer to?

A "SIP Fork" refers to the scenario where multiple devices are registered to the same extension, allowing simultaneous communication on that extension. This functionality is useful in environments where a user may want to receive calls on multiple devices, such as a desk phone, a softphone on a computer, and a mobile phone all registered to the same extension. This capability ensures that when a call comes in to that extension, all registered devices will ring, giving the user the flexibility to answer on any of those devices.

This setup is particularly beneficial for enhancing accessibility and ensuring that important calls are not missed, allowing for a seamless transition between devices while maintaining a single point of contact for callers. The ability to fork calls in this manner is intrinsic to the design of the SIP protocol, which supports this type of functionality to accommodate various user needs.