2N SmartGate - User Manual - Manual (Page 17)

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5.2. Gateway for extension line of PBX
Extension line of PBX is connected to FXO interface on SmartGate. FXS interface
remains unconnected.
You have to program parameter “FXO call route to” for proper function on FXO interface.
You can fill in some rows in FXO routing table to reject given calls, for automatic call routing
etc.
Fill in GSM routing table to route an incoming GSM calls to FXO interface.
It is necessary to set up conditions for call-disconnect detection from PBX. If SmartGate
detects busy tone or continuous tone from PBX, it disconnects the established GSM call.
5.2.1. Outgoing call on FXO interface
1. SmartGate detects a ringing signal from PBX and, if it is possible to establish GSM
call, it hooks off the line after preprogrammed number of rings. SmartGate transmits
dial tone and green LED for line starts flashing.
2. Dial the GSM subscriber number using DTMF. The delay between dialed digits may
not exceed 5 s (programmable parameter). The number is evaluated as complete after
this timeout.
3. A short delay follows the last-dialed digit for SmartGate to await further dialing.
Then, the dialing end is signaled and connection is established.
4. Prefix of dialed number is compared with filled rows of FXO routing table. The call is
rejected or routed to GSM network according to the routing table.
5. If the called subscriber is available, you can hear the ringing tone. If not, SmartGate
hangs up.
6. When the called subscriber answers the call, a call is established. The green Line
LED is permanently on during the call.
7. Hang up to terminate the call. PBX sends busy tone to SmartGate’s subscriber line,
SmartGate detects it and disconnects the GSM call.
5.2.2. Incoming call from GSM network
1. The CLI is compared with filled rows of GSM routing table. The call is rejected, or
routed to FXO interface – extension line of PBX according to the routing table.
2. SmartGate hooks off the line. If there is filled in the “Dial in” parameter for given CLI,
SmartGate dials it using DTMF.
3. The GSM subscriber hears the ringing tone from PBX if the automatic dial in
function was applied, if not he hears dial tone from PBX and he can dial required
extension himself.
4. The call termination is the same as in case of outgoing call.