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LynxONE Audio
Interface –
Recording
Format
E1/T1 Interfaces
4.2.3 The OptiCall™ Program
Basic Principle
Making Calls with
Remote Machines
Different User
Interfaces for
Different
Applications
Common Settings
C H A P T E R
4 :
G E T T I N G
F R A M E W O R K
To achieve the highest possible accuracy, all recordings from the LynxONE
interfaces will be made in stereo and at 24bit resolution. After applying any
eventually required gain factors, the files will be stored as 16bit stereo. When
using the interfaces for mono measurements on e.g. VoIP terminals, simply use
the OPERA crossbar switch matrix as described in chapter 4.4.3 to select the
channel on which your device under test was connected.
E1/T1 interfaces are optionally available for OPERA™ as well. The standard
version includes two trunks (four port versions are available on request too)
which may be software configured as E1 or T1. Various protocols and protocol
versions are supported, including CAS, MFCR2 and ISDN PRI. Each individual
time slot will show up in OptiCall™ as an individual interface. All timeslots may
be used simultaneously. The detailed configuration and usage of the E1/T1
interface option is described in a separate manual.
Data acquisition for offline measurements is performed using the external
program OptiCall.exe. Online measurements are handled by the OPERA™
framework directly.
The principle of OptiCall™ is easy. First a connection is established between any
two selected interfaces and then the speech/audio data are transferred through
the selected interfaces. Simultaneously OptiCall™ records all the incoming data
on both sides of a full duplex connection. OptiCall™ is not restricted to
telephony interfaces only, it can make use of audio interfaces as well. If for
either the originating, or the terminating side (or both sides) an audio interface is
selected, the call control is simply skipped for this particular interface, and the
audio interface is in the connected state immediately. Using the audio
interfaces, OptiCall™ can also be used for the assessment of wide band audio
codecs (like e.g. MPEG or AAC codecs), multimedia terminals or any other
terminal type equipment.
One of the key features of OptiCall™ is running the user interface on the local
machine, but the call may be executed on a remote machine. This is
accomplished by simply telling OptiCall™ the name of the remote machine.
Since OptiCall™ supports
specific, it comes with three different graphical user interfaces. The
Standard View
is mainly designed for pure audio applications that do not
require complex settings for phone numbers etc. The
View
is the GUI most frequently used in telecom applications for issuing test
calls. It provides all required parameters for setting up simple loop calls, for
originating a call or for terminating a call. If more features like bulk call
generation are required, the
functionality of OptiCall™ is available. Switch easily between the views by
clicking with the right mouse button into the blue title bar of OptiCall™. The
following sections will explain all views in detail.
In all modes OptiCall™ can be configured to run on either the local machine or
any other OPERA system that is connected through a TCP/IP connection. The
field
Network Node
which is available in all views, must always be set to the
network name of the machine which is hosting the interface which you want to
use for the call. Alternatively the IP address of the host may be entered. To use
two interfaces which are located on different machines, simply open two
instances of OptiCall™. OptiCall™ will try to establish a connection to the
T O
K N O W
T H E
various options that are frequently application
Expert View
is the best choice. In this view the full
40
O P E R A ™
Audio
Telephony Standard
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