How to configure Airtel SIP trunk

register => +917949031XXX@gj.ims.airtel.in:XXXXXne#1:+917949031XXX@gj.ims.airtel.in@10.5.110.101/+917949031XXX

[AirtelSIP]

disallow=all

allow=all

type=friend

dtmfmode=rfc2833

qualify=yes

nat=force_rport,comedia

insecure=invite,port

host=gj.ims.airtel.in

username=+917949031XXX@gj.ims.airtel.in

secret=XXXXX#1

fromdomain=gj.ims.airtel.in

defaultexpirey=120

canreinvite=no

context=trunkinbound

maxexpiry=600

progressinband=yes

exten => _65X.,1,AGI(agi://127.0.0.1:4577/call_log)

exten => _65X.,n,SipAddHeader(P-Preferred-Identity: <sip:+917949031XXX@gj.ims.airtel.in>)

exten => _65X.,n,Progress()

exten => _65X.,n,Dial(SIP/${EXTEN:2}@AirtelSIP,,tTo)

exten => _65X.,n,Hangup()



for custom callerid 

;;;;USE CALLER IN HEADER as AIRTEL REQUIRED CID IN HEADER

exten => _67X.,1,AGI(agi://127.0.0.1:4577/call_log)

exten => _67X.,n,Set(CALLERID(num)=+${CALLERID(num)})

exten => _67X.,n,SipAddHeader(P-Preferred-Identity:<sip:+${CALLERID(num)}@mu.ims.airtel.in>)

exten => _67X.,n,Progress()

exten => _67X.,n,Dial(SIP/0${EXTEN:2}@AirtelSIP,,tTo)

exten => _67X.,n,Hangup()