System information

extensions.conf
As in the last example, you will need line1 and line2 contexts to process incoming calls
on these trunks:
[line1]
exten => s,1,SLATrunk(line1)
;
; If the provider specifies your phone number when sending you
; a call, you will need another rule in the dialplan to match that.
;
exten => _X.,1,Goto(s,1)
[line2]
exten => s,1,SLATrunk(line2)
exten => _X.,1,Goto(s,1)
This example requires an sla_stations context, as well. This is for all calls coming from
the phones. It’s the same as it was in the last example:
[sla_stations]
exten => station1,1,SLAStation(station1)
exten => station1_line1,hint,SLA:station1_line1
exten => station1_line1,1,SLAStation(station1_line1)
exten => station1_line2,hint,SLA:station1_line2
exten => station1_line2,1,SLAStation(station1_line2)
exten => station2,1,SLAStation(station2)
exten => station2_line1,hint,SLA:station2_line1
exten => station2_line1,1,SLAStation(station2_line1)
exten => station2_line2,hint,SLA:station2_line2
exten => station2_line2,1,SLAStation(station2_line2)
exten => station3,1,SLAStation(station3)
exten => station3_line1,hint,SLA:station3_line1
exten => station3_line1,1,SLAStation(station3_line1)
exten => station3_line2,hint,SLA:station3_line2
exten => station3_line2,1,SLAStation(station3_line2)
exten => station4,1,SLAStation(station4)
exten => station4_line1,hint,SLA:station4_line1
exten => station4_line1,1,SLAStation(station4_line1)
exten => station4_line2,hint,SLA:station4_line2
exten => station4_line2,1,SLAStation(station4_line2)
The last piece of the dialplan that is required is the implementation of the line1_out
bound and line2_outbound contexts. This is what the SLA applications use when they
want to send calls out to a SIP provider. The key to this setup is the usage of the
DISA() application. In the last example, phones were directly connected to an analog
line. This allowed the upstream switch to provide a dialtone, collect digits, and then
324 | Chapter 14: Device States