www.sahabtec.com
Page51
XonTel S200 Administrator's Guide
Figure 6-17
6.2
Trunks
6.2.1
Physical Trunk
Multiply physical trunks are supported in XonTel PBX S200, like BRI, PSTN, and
GSM/UMTS, please make sure you have installed the modules inside, BRI trunk
requires B2 module, PSTN trunk requires the FXO module, while GSM/UMTS
trunk, and please install the GSM/UMTS modules inside.
Figure 6-18
BRI Trunk
Basic Rate Interface (BRI, 2B+D, 2B1D) is an Integrated Services Digital
Network (ISDN) configuration intended primarily for use in subscriber lines
similar to those that have long been used for plain old telephone service. The
BRI configuration provides 2 bearer channels (B channels) at 64 kbit/s each and
1 data channel (D channel) at 16 kbit/s. The B channels are used for voice or
user data, and the D channel is used for any combination of data,
control/signaling, and X.25 packet networking