Interfaces

Interfaces represent trunks normally to non-IP world. I'ts possible to create more interfaces than the default ones (PBX and PSTN) (Figure 7.75. Examples: GSM ISDN or FAX's interface. You can create them at:

Advanced Configurations - Telephony - Interfaces

**Figure 7.75:** Telephony - Interfaces

Menu to insert interfaces (Figure 7.76):

Interface Name: When created, the interface will appear by that choosed name at Local Routes and Telephony Cards port configuration;
Interface Type: Represents the associated trunk:
- BRI PSTN: Represents the PSTN side using a ISDN BRI connection;
- BRI PBX: Represents the PBX side using a ISDN BRI connection;
- PRI PSTN: Represents the PSTN side using a ISDN PRI/E1 connection;
- PRI PBX: Represents the PBX side using a ISDN PRI/E1 connection;
- ANALOG PSTN: Represents the PSTN side using a ANALOG connection;
- ANALOG PBX: Represents the PBX side using a ANALOG connection;
- OCS: Represents the Microsoft Office Communications Server. That interface will be used only for Local Routes (Figure 7.77). For that interface type two extra fields are present:
  - FQDN: OCS fully qualified domain dame;
  - Mediation Server IP: Mediation Server IP address;
SIP Peering: The Open Peer option provides that any incoming call from the Internet can use this interface. The Closed Peer option sets that only peers defined in SIP Peers can use the interface(this is the best option connect to PSTN or GSM). So peers are public IP's authorized to use certain interface, for instance a peer can be another IPBrick. They can be inserted at:
```
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 7.76:** Telephony - Interface insertion

**Figure 7.77:** Telephony - OCS interface

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