2N StarGate/BlueTower v5.5 - Manual (Page 50)

50
2N TELEKOMUNIKACE a.s., www.2n.cz
®
ISDN PRI Connection
The gateway can contain a PRI card with one or two ISDN PRI interfaces (depends on
the part number). PRI 1 is always set as an internal interface (PBX connection) and PRI
2 as an external interface (PSTN connection). The Least Cost Routing (LCR) and
additional routing mechanisms are activated on the internal interface. All incoming calls
to the external interface are always routed directly to the internal interface.
Interface ISDN PRI (E1 frame) –
Signalling Q.931 – EDSS1 –
Signalling channel (D-channel) 16. –
Network interface type NT or TE (adjustable by web interface)* –
TEI number 0 – 63 (adjustable by web interface) –
CRC on Layer 1 Activated/deactivated (adjustable by web interface)* –
Connector type Switchable RJ45 (see Subs. 2.1) –
Supported voice codec G.711a** –
Supported B-channel services – Only voice**
*The PRI 2 interface is always of the opposite type than the PRI 1 interface.
**Other streams are sent directly to the opposite PRI interface.
Installation Examples
There is an exact time source for synchronisation of the PRI interface lines on the PRI
board. Even if you have synchronisation problems on the installation site (caused by
specific and probably ill-configured PBXs with more that one active PRI interfaces),
there is a solution as shown below. Before using this solution you are recommended to
configure your PBX properly, or use the DialThru function. Red lines are calls to the
PSTN, orange lines are calls to GSM/UMTS networks.
Figure: DialThru Function Installation
Caution
For a successful VoIP card initialisation, the VoIP board MAC address has
to be filled in correctly and the basic CPU must be switched to the
VoIP–SIP mode and contain the VoIP firmware file.
The integrated Ethernet will not work until the VoIP card has been
initialised successfully.