IOGear GBHFK231 - Manual (Page 20)

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Note: If the Car Kit does not connect back to the first phone or having
problem staying connected with any one of the two phones, try to power
cycle the Car Kit and it should reconnect back to the two phones.
Answering call from the second phone during a call on the first phone
When a new call comes in on the second phone, quick tab the MFB button
twice to hold the call on the first phone and pick up the call from the second
phone. Quick tab the MFB button twice again to switch from the call on the
second phone back to the call on the first phone.