Interfaces

IPBrick can create more interfaces than PBX and PSTN (Figure 7.70) like GSM or FAX interface. You can create them in:

Advanced Configurations - Telephony - Interfaces

Figure 7.70: Telephony - Interfaces

Menu to insert interfaces (Figure 7.71):

• Interface Name;
• Interface Type: To what interface is associated IPBrick card;
• SIP Peering: The Open Peer option provides that any incoming call from the Internet uses this interface. The Closed Peer option sets that only Peers defined in SIP Peers (this is the best option connect to PSTN or GSM). The Peers are the IP from machines authorized to use certain interface, for instance another IPBrick. Can be inserted in the menu:

  Advanced Configurations - Telephony - SIP Peers
  

• Receive gain: Receive gain in dB. Can be useful to increase it if we are talking about the PSTN interface and at the IPBrick side we are listening with low volume;
• Transmission gain: Transmission gain in dB. Can be useful to increase it if we are talking about the PSTN interface and at the PSTN side they are listening with low volume;

This operation is necessary if you want to connect a FAX to a card port, a GSM gateway or another additional interface. If there is a GSM gateway, you may add here a GSM interface (as an interface name). Choose a card type (analogic, PRI or BRI) in the Interface Type , and the Closed Peer option in the SIP Peering.

Figure 7.71: Telephony - Interface insertion