Other Settings

You can adjust a number of miscellaneous settings through this dialog which normally aren’t altered. Note, however, that the correct configuration MUST be made for to operate!

Other settings configuration dialog:

G.711 law

North America/Japan and Europe use a different coding method for ISDN telephony.

Thus, the following alternatives are available:

Note:

If G.711 law is not set properly then strong disturbances occurs at G.711 transmissions.

G.711 Attenuation

Sometimes G.711 signals (i.e. normal telephone signals) are over modulated and therefore their too high audio levels can cause distortions. Therefore G.711 attenuation can be set to:

G.722 SRT Timeout

- defines the G.722 ‘timeout’ (measured in Seconds).

Generally, there are two methods to synchronize G.722 data streams.

Generally, there are two methods of determining the ‘octet-start’ (byte-start) in G.722 data streams.

They are:

codecs will auto-detect a G.722/H.221 data-stream since they evaluate the H.221 in-band signalling information. However, as G.722 SRT signals do not have such signalling, only switches to the G.722 SRT setting when the ‘G.722 timer’ expires and framing has yet to be achieved. This G.722 timer starts once the first ISDN line is connected.

It is recommended that the G.722 SRT timeout be set to ~30 Seconds. This value is high enough not to interrupt any auto-detection process, but should still be acceptable for framing up.

Note:
You can enter values other than those shown, but the maximum possible value is 9,999 seconds

Disconnect Timeout

- defines the period (in seconds) after which a connection is dropped, if no valid framing is achieved. Ideally, it should be set higher than the G.722 SRT timeout value – its default value is 45 Seconds.

Note:
You can enter values other than those shown, but the maximum possible value is 9,999 seconds.

ISDN Answer Delay

- defines the ‘telegram’ interval (used in ISDN connections) - in milliseconds. It depends on the system software version how it works

system software < 2.1.0.2:

With an ISDN connection, the called sends out a ‘telegram’ once the first B-channel is connected and the ISDN answer delay has expired.

The default value (of 3,000 ms) is usually long enough, but if there are framing problems with multiple B-channel ISDN connections, this value can be increased.

system software >= 2.1.0.2:

With an ISDN connection, the called sends out its ‘telegram’ 10 times till the ISDN answer delay expires. The default value is 5,000 ms.

Note:

You can enter values other than those listed, up to the permitted maximum of 30,000 ms

ISDN Active Layer 1

- determines whether ISDN Layer 1 stays active all the time, or not.

When is used in the Netherlands, this value should definitely be set to ON.

Dial In Protection

- selects whether Dial-in Protection is activated for:

When Dial-in Protection is set to On, only connections from ISDN numbers (or IP addresses, as appropriate) which are stored in the Phone book will be accepted.

Accept Mode

- determines how Incoming connections are accepted.

Dual Mode At B-channel

With ISDN can be used as two separate mono codecs. However, the following restrictions will apply:

This setting defines on which B-channel the ‘second (sub) codec’ starts to communicate.

For example:

‘Dual mode on B-channel = 2’ means that B-channel 1 is assigned to the first (sub)codec and all other B-channels are assigned to second one.

If dual mode at B-channel = 0 then dual mode is de-activated, and functions as a single codec, without the above restrictions.

Note:

Dual mode just can be set if the communication interface of both sub codecs is set to ISDN. If this is not true dual mode can not be set or does not work properly pending on the system software version.

Select Sub codec

Although at special applications (e.g. Dual mode, Backup, Gateway) supports more than one sub code, only one input interface is available. This setting lets the user select to which internal (sub) codec the input and display applies to.

If dual-, backup or gateway-mode is used, the selected sub codec (either 1 or 2) is displayed in the main program window. This differs with a 4000/4001, which contains 4 codecs!

The sub codec can also be selected in the main window with help of short cut keys. More info about short cut keys can be found in the help chapter Wheel button dialog and special keys/Short Cut Keys.

Multi Point Return Channel

- determines which return Channel is used on a Point-to-Multipoint transmission.

[Using ISDN, Point-to-Multipoint means that a codec can transmit one audio signal out to multiple ISDN destinations. However, with Point-to-Multipoint (PMP) just can decode one return channel. This option allows you to define which of the return paths you wish to use.]

PMP functionality works with any of the following:

•

Note:

If PMP value is not set to 0, then the PMP return is also displayed in the main window.

If the value IS set to 0, PMP is deactivated.

The number of possible return channels is calculated by:

number of PMP-channels = (number of B-channels*64kbit/s) /encoder bit rate

Note 2:

With system software version 2.0.0.57 (or later) even negative return channels can be selected. A negative return channel means that all multi point locations still receives the audio but the central does not decode any audio.

UDP Broadcast Mode

- enables UDP broadcast mode. All UDP audio datagrams are now addressed to the UDP “broadcast” address (255.255.255.255), and UDP broadcast reception is enabled.

Backup

- enables to configure the backup feature of the if the referring additional function is implemented (see menu item Expert/Set Key Code). Backup feature means that establishes automatically another connection if framing is lost. Two Backup parameters can be set:

Note:

A general description of the backup feature can be found at chapter Miscellaneous/Backup.

Gateway

- enables to configure the gateway feature of the if the referring additional function is implemented (see menu item Expert/Set Key Code). Gateway functionality means that routs received audio from one interface to another one (e.g. MPEGL2 audio received at ISDN is sent out as MPEGL3 audio via IP) The following parameters can be selected:

The phone book entry can be selected in the right edit field:

or

Note:

A general description of the gateway feature can be found at chapter Miscellaneous/Gateway.