AT&T Merlin Legend 10BS User Manual page 171

Features
To Answer a Camp-On Call
Answering a call that has been transferred to your phone and
left there with Camp-On is the same as answering a Call
Waking call.
1. Do one of the following:
If you have more than one call waiting, you receive them in
the order in which they arrived.
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T r a n s f e r
If your extension was busy when the call arrived,
the call rings as soon as an SA or ICOM button
becomes free. Answer it as you would any
other call.
If your extension was not busy when the call
arrived, when you are ready, press the
programmed Feature button and dial 87.