lgaetz-el_cid

el_cid.conf

;  FreePBX user dialplan for setting the outgoing Caller ID dynamically on a per-call basis to match
;  the NANP area code of the destination number
; 
; Latest version:
;      https://gist.github.com/lgaetz/2b3d67a30f86a827121b004ec2f3024a
;
; Usage: 
;   Content below goes in /etc/asterisk/extensions_custom.conf
;
; License:  GNU GPL3+
;
; Version History
;      2019-06-15 First commit by lgaetz
;      2019-06-17 Added check for emerg call to bypass
;      2019-06-29 Added check for incomming calls forwarded off system to bypass
;      2019-07-01 Updated check for incoming call
;      2019-07-01 only extract area code fr 10/11 digit numbers

[macro-dialout-trunk-predial-hook]
exten => s,1,noop(Entering user defined context macro-dialout-trunk-predial-hook in extensions_custom.conf)
; exten => s,n,DumpChan  ; uncomment for debug

; check if this is an emergency call, and if so bypass all customization. Emerg calls must use an outbound route with the
; Emergency option toggled
exten => s,n,ExecIf($["${EMERGENCYROUTE}"="YES"]?MacroExit)

; check if outbound channel started as an incoming call
; if call is from an inbound route don't change CID
exten => s,n,ExecIf($["${FROM_DID}"!=""]?MacroExit)           ; FreePBX < 12+
exten => s,n,ExecIf($["${DIRECTION}"="INBOUND"]?MacroExit)    ; FreePBX 12+

; determine the NANP area code of the outbound number
; check to ensure we have 10/11 digit number, and take the 3 digits
; from the rightmost 10 digits. This works for both 10 and 1+10 digit dialing
exten => s,n,noop(Outbound Number: ${OUTNUM})
exten => s,n,ExecIf($[${LEN(${OUTNUM})}=10 || ${LEN(${OUTNUM})}=11]?set(area_code=${OUTNUM:-10:3}))
exten => s,n,noop(Area Code: ${area_code})

; check the outbound-el-cid context to see if there is a specified CID matching the area code
; if specified area codes exists, use it otherwise generate random CID
exten => s,n,GosubIf($[${DIALPLAN_EXISTS(outbound-el-cid,${area_code},1)}]?outbound-el-cid,${area_code},1:outbound-random-cid,s,1)

; log outgoing CID and continue
exten => s,n,Noop(Call proceeding with Outbound CID: ${CALLERID(number)})
exten => s,n,MacroExit

; end context [macro-dialout-trunk-predial-hook]


[outbound-el-cid]
; Subroutine that accepts exactly 3 digits and matches to a corresponding outbound CID 
; one line per CID with the format as follows:
;           exten => aaa,1,Set(CALLERID(number)=bbbbbbbbbb)
; where aaa is the 3 digit NANP area code and bbbbbbbbbb is the outbound cid for the call

exten => 902,1,Set(CALLERID(number)=9025554444)
exten => 920,1,Set(CALLERID(number)=9205553333)
;  add additional lines as necessary

; this final line is required in order to send the call flow back to the calling gosub line
exten => _XXX,n,Return

; end context [outbound-el-cid]

[outbound-random-cid]
; this context generates a random number and chooses from a list of fixed outbound caller IDs
; based on the random result

exten => s,1,noop(Entering user defined context outbound-random-cid in extensions_custom.conf)
exten => s,n,Set(foo=${RAND(1,3)})  ;choose a random number between 1 and 3
exten => s,n,Noop(choosing random CID #${foo})
exten => s,n,goto(${foo},1)
exten => 1,1,set(CALLERID(number)=5551111111)
exten => 2,1,set(CALLERID(number)=5552222222)
exten => 3,1,set(CALLERID(number)=5553333333)
; add additional lines as necessary

; this final line is required in order to send the call flow back to the calling gosub line
exten => _X!,n,Return

; end contxt [outbound-random-cid]