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C H A P T E R
4 :
G E T T I N G
F R A M E W O R K
Figure 4.18 shows the OptiCall™ window after Termination has been
selected. Operation is the same as in the Origin mode, except for the missing
Phone Number field that is not required for terminating a call.
Since in the Termination mode OptiCall™ is sending and receiving
simultaneously on the same interface, this mode may also be used for assessing
audio codecs with a single Audio Interface Option.
Hint:
By using OptiCall™ in the termination mode echo measurements
may be performed to remote sites even if there is no other
OPERA system available. Simply start OptiCall™ and ask
somebody on the remote site to call your OPERA system using a
regular telephone. OptiCall™ will answer the call, play the speech
file and record the echo signal. Of course it is advisable that the
calling person is either switching off the microphone or at least
covering it with the hands.
Figure 4.18: The OptiCall™ window in termination mode
"Terminate all" Mode
If OptiCall is put into the Terminate all mode, it behaves like in the Termination
mode on all the available telephone lines. That means all incoming calls on all
lines are answered. After answering any incoming call, the system is waiting for
the next call. This procedure is repeated endlessly for all line interfaces.
Multiple calls arriving on separate interfaces may be answered simultaneously.
The Terminate all mode is especially useful if no IP connection exists between
two OPERA systems. In this case it is enough to put the remote system in the
Terminate all mode and use the local machine in the Origin mode. Since the
terminating side is sending the speech file, voice quality can be evaluated, but
the echo signal will be lost since it is recorded on the remote machine.
T O
K N O W
T H E
O P E R A ™
48
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