3Com NBX 100 Administrator's Manual page 256

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ONFIGURATION
How Call Timer Works With Other Telephone Features
Table 33 documents how Call Timer works with other PBX-type features.
Table 33 Call Timer Behaviors
Feature Description
Internal Call The call duration appears on the originating phone when the user
finishes dialing the destination number. The call time starts to
increment even though the called number is still ringing.
Call Timer does not work if the caller enters an invalid internal
extension.
External Call Call Timer behavior in an external call is the same as that of an
internal call except in these cases:
In these cases, the call time continues to advance.
Hold When you put a call on hold, the system hides the Call Timer
display. However, the Call Timer count continues to increment
during the time that the call is on hold. When you take the call off
hold, the Call Timer reappears.
Transfer When you transfer a call, the Call Timer count does not carry
forward to the transfer destination. During the time period that the
call is ringing on the transfer destination phone, however, the Call
Timer count continues to increment on your phone.
When the user to whom the call was transferred answers the call,
that user sees the Call Timer count start from zero.
Conference The Call Timer value on the phone that originated the call
Call increments from the time at which the call originated.
The Call Timer value on each phone that is added to the conference
increments from the time the conference participant answered the
phone.
If the conference originator drops other parties in the conference
and stays with one party at the end, the Call Timer is based upon
the total time the two parties spent in on the call, including any
time before or during the conference.
Call Park Call Park behavior is same as that of Transfer. However, if the
phone that unparks the call is the same phone that parked the call,
Call Timer shows the total time as based upon the time when the
initial call originated.
If the caller enters an invalid external number
If the phone of the called number is busy