A: When there is a new incoming call during one call:

* Single press the MFB to answer the new call and hang up the

current call.

* Double press the MFB to answer the new call and hold the

current call.

* Press and hold the MFB for 1 second to keep the current call and

reject the new call.

* During a three-party call, double press the MFB to switch audio

between the current call and the held call.