Polycom IP 650 - Manual (Page 49)

Using the Basic Features of Your SoundPoint IP 650 SIP Phone
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— Press and select Call Lists > Placed Calls, and then
scroll through the list to find the specific call.
2. Press the Dial soft key.
Putting a Call on Hold
During a call, press or the Hold soft key. This will be indicated on the
graphic display by the hold icon as the line indicator.
Press again or the Resume soft key to retrieve the call. The registered
line icon appears as the line indicator.
Note These steps also apply to the Missed Call and Received Call lists.
Note As using the Hold feature typically generates music or a beeping tone, avoid putting
a conference call on hold.