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An active call is placed "on hold" when you use the "flash/link" button (on your phone - or quickly depressing and releasing the switch-hook) to:
•answer a second incoming call (the first call is put "on hold")
•make another call, to conference in with the previous call(s)
•transfer a call to another number
Hitting MUTE or the HOLD button on your phone will NOT provide Music On Hold... so your conferenced callers can keep on talking.
User MTS_EMPLOYEE reports that music on hold can now be changed by contacting Primus Technical Support.
Music on hold can be changed, no matter who you are...MGCP or SIP protocol (D-Link or Linksys gateways).