1. Asterisk Database (AstDB)
Database data are grouped in families and identified with a key that is unique within the family. AstDB’s structure is similar to the following: Family1 Key1 => value Key2 => value : Keyn => value Family2 Key2 => value

2. Asterisk Database’s Applications
Applications: DBput DBget DBdel DBdeltree Dbput Stores value in the database Dbput(family/key=${foo}) (deprecated) Set(DB(family/key)=${foo}) (new syntax) CLI Command CLI*>database put family key

3. Asterisk Database’s Applications
Dbget Retrieve a value from the database Dbget(foo=family/key) (deprecated) Set(foo=${DB(family/key)}) CLI Command CLI*>database get family key Dbdel Delete a key from the database Dbdel(family/key) CLI Command CLI*>database del

4. Asterisk Database’s Applications
Dbdeltree Delete a family or key tree from the database Dbdeltree(family/keytree)

5. Call Forwarding
Forward the incoming call to some other number, or forward the incoming call to some other number in case of busy or unavailable
Two types of abbreviations are used:
Call Forward IMdiate (CFIM)
Call Forward on BuSy (CFBS)

6. Call Forwarding
An example of call forwarding: [apps] ; ; Unconditional Call Forward ; ; create call forward exten => _*21*X.,1,GotoIf($${EXTEN:-1} = #?2:3) exten => _*21*X.,2,StripLSD(1) exten => _*21*X.,3,DBput(CFIM/${CALLERIDNUM}=${EXTEN:4}) exten => _*21*X.,4,Hangup ; ; delete call forward exten => **21,1,DBdel(CFIM/${CALLERIDNUM}) exten => **21,2,Hangup ; ; delete call forward (with #) exten => **21#,1,Goto(**21,1)

7. [macro-stdexten]  ;   ; Standard extension macro (with call forwarding):   ; ${ARG1} - Extension(we could have used ${MACRO_EXTEN} here as well   ; ${ARG2} - Device(s) to ring   ;   exten => s,1,Set(temp=${DB(CFIM/${ARG1})})  exten => s,n,GotoIf(${temp}?cfim:nocfim)  exten => s,n(nocfim),NoOp  exten => s,n,Dial(${ARG2},15) ; 15sec timeout   exten => s,n,Set(temp=${DB(CFBS/${ARG1})})  exten => s,n,GotoIf(${temp}?cfbs:nocfbs)  exten => s,n(nocfbs),Busy

8. Fowarding [forward-test] exten => *21*,1,PlayBack(thanks)
exten => *21*,2,read(for)
exten => *21*,3,Set(DB(CFIM/${CALLERID(num)})=${for})
exten => 801,1,Macro(callforward,${EXTEN})
[macro-callforward]
exten => s,1,Set(temp=${DB(CFIM/${ARG1})})
exten => s,n,GotoIf(${temp}?cfim:nocfim)
exten => s,n(cfim),Dial(SIP/${temp})
exten => s,n,hangup
;Unconditional forward 
exten => s,n(nocfim),Dial(SIP/${ARG1})

9. Call Monitoring
Taps into a phone call between a caller and a callee. This is possible with:
ChanSpy()
ZapBarge()
ExtenSpy()
Example
While spying
Dialing # cycles the volume
Dialing * will stop spying and look for another channel to spy on

10. Call Monitoring
ZapBarge() Listens in on a conversation on a zap channel. If a channel is not specified, it will prompt for one Example Exten => 8159,1,ZapBarge() Exten => 8159,2,Hangup() If you dial 8159, you are asked which line you want to listen on; for zap/1-1 you will press 1# and for zap/25-1 you will press 25#

11. Call Monitoring
ExtenSpy() Listen in on a channel, and also whisper into it if necessary Example [snoop] exten => _555/705,1,ExtenSpy(|v(4)) [705] exten => 705,1, dail(IAX2/trunk_3) include => snoop

12. Call Monitoring
Add the following lines in extensions.conf exten => *898,1,Answer exten => *898,2,Wait(1) exten => *898,3,Goto(spy,s,1) exten => *898,4,Hangup [spy] exten => s,1,BackGround(please-enter-the) exten => s,n,BackGround(extension) exten => s,n,Set(TIMEOUT(digit)=5) exten => s,n,Set(TIMEOUT(response)=10) exten => s,n,WaitExten(10) exten => _XXXX,1,ChanSpy(SIP/${EXTEN}|q)

13. Call Transfer
Transfer a call-in-progress to another destination. There are two types of transfers:
Supervised Call Transfer
Blind Call Transfer
Features.conf settings:
blindxfer => #1
disconnect => *0
atxfer => *2

14. Call Parking
Places a call on-hold onto a specific parking location so that it can be picked up by another extension Features.conf Parkext => 700 Parkpos => Context => parkedcall Parkingtime => 45

15. Route by Caller ID
exten => 123/100,1,Answer()    exten => 123/100,2,Playback(tt-weasels)    exten => 123/100,3,Voic (123)    exten => 123/100,4,Hangup()