IVR and QUEUE

Hi!

I already wrote about Asterisk.
Now I have two configure files: /etc/asterisk/lad_exten/ivr and /etc/asterisk/lad_exten/queue
/etc/asterisk/lad_exten/ivr:
[ivr-non-work]
exten => s,1,PlayBack(lad/hello_non_work)
exten => s,n,WaitExten(4)
[queue-ivr]
exten=>1,1,Dial(DAHDI/g12/603,2400,tT)
exten=>2,1,Dial(DAHDI/g12/135,2400,tT)
exten=>3,1,Goto(queue-out,s,1)
[queue-out]
exten => s,1,PlayBack(lad/hmr)
exten => s,n,Background(lad/alter_info)
exten => s,n,WaitExten(30)
exten => 1,1,goto(queue-out,s,1)
exten => 0,1,goto(queue-work,s,in)

and /etc/asterisk/lad_exten/queue:
[queue-tech]
exten => 499,1,GotoIfTime(8:00-18:00|mon-sun||?queue-work,s,1)
exten => 499,n,GotoIfTime(8:00-17:00|fri||?queue-work,s,1)
exten => 499,n,Goto(ivr-non-work,s,1)

exten => 498,1,Goto(ivr-non-work,s,1)
[queue-work]
exten => s,1,Answer()
;exten => s,n,Set(CHANNEL(musicclass)=queue)
exten => s,n,Playback(lad/privetstvie_work)
exten => s,n,Playback(lad/extr_work)
exten => s,n(in),Queue(technical)
exten => s,n,Hangup()

Numbers 499 and 498 it for tests.
I will connect 10 analog lines to Asterisk (I have a PCI card with 24 ports)
14 from this ports I configure to internal analog lines, other 12 – external analog lines.
In DAHDI.conf I will write name of context, where calls will come in.

Now questions, how I must describe context in extensions.conf for IVR and QUEUE ?