Analog and ISDN PRI options

Parameters only for the analog/ISDN PRI cards, that will be adjusted at the driver configuration files used for that cards - dahdi (Figure 7.89):

• Channel tone zone: Country tone zone. Frequencies may vary from country to country. Select the appropriate tone zone for your location;
• Echo cancel: Minimizes echo during calls;
• Type of Number (ISDN TON): Type of Number (TON) indicates the scope of the address value, such as whether it is an international number (i.e. including the country code), a "national" number (i.e. without country code), and other formats such as "local" format (i.e. without an area code). This types of number are then presented to the operator if, for example, you leave the default option (Unknown) the operator will identify the type of number.
  • These are the available options both for the Callee (Calling Number) and Caller (Caller Number):
    • Unknown - The default option. The most common setting, when unknown is configured your telephony operator will handle the number's TON;
    • Local - The number will be without area code;
    • Private - The number will not be displayed it will not be possible to redial or callback;
    • National - The number is presented without country code;
    • International - The number will include the country code;
    • Dynamic - This option will permit the TON's auto detection and is based on the prefix configured at the next field (Prefixes based on ISDN TON);
  • Prefixes based on ISDN TON: This option is related to the card's call reception and the Dynamic TON, in such a way that, if you receive a PSTN incoming call, with an international or national type of number, the corresponding prefix will be added to the incoming numbers. This feature is important to facilitate the call redial function;
• R2 signalling options: If the R2 signaling protocol is used (old ISDN protocol) you can define here the R2 parameters:
  • DNIS: Dialed Number Identification Service value;
  • ANI: Automatic Number Identification value;
  • Zone/Country;

Figure 7.89: Telephony - Analog and ISDN PRI options