ISDN BRI options

Parameters only for the ISDN BRI cards, that will be adjusted at the driver configuration files used for that cards - misdn (Figure 7.68):

• Echo cancel: The default is High. Other options: Disabled, minimum, low and maximum (requires more CPU processing);
• DTMF detection threshold: Permit to change the DTMF sensibility from 50 to 400 (less sensibility);
• Immediate digit capture: The immediate capture of digits changes the way how the numbers sent from a PBX central are read in IPBrick. When this option is deactivated, the routine capture of digits is changed to solve problems in the reading of numbers in some central stations, for example, when the dialled number is wrongly identified in IPBrick (repeated digits or lack of digits). Attention: This option should be placed No by default;
• PSTN digit reception timeout: Timeout in seconds;
• Jitter Buffer: Permit the change of Jitter Buffer^7.15;
• Digit timeout: Time (seconds) from the dialling of the last number from which IPBrick considers the dialling as ended;
• Response timeout: Time (seconds) counted from the moment the receiver is hung up and at its end IPBrick shall cancel the channel;
• Type of Number (ISDN TON): Low level signalling options
  • Outgoing number (onumplan): Unknown is the default, other options are national, international and subscriber;
  • Caller id (dnumplan): Unknown is the default, other options are national, international and subscriber;
  • CPN (cpnnumplan): Unknown is the default, other options are national, international and subscriber.

Figure 7.68: Telephony - ISDN BRI options

Footnotes

... Buffer^7.15

Shared data area where voice packets can be collected, stored, and sent to the VoIP server in evenly spaced intervals