There are two types of authentications
1. IP based authentication
2.Username and Password based authentication
For IP Based Authentication
You need to do the following changes in the sip.conf
[siptrunk]
type=friend
fromuser=X.X.X.X ( your asterisk server ip ) which will send traffic to the service provider
host=X.X.X.X ( service provider ip )
canreinvite=no
qualify=no
dtmfmode=RFC2833
context=intenal
disallow=all
allow=g729
allow=ulaw
allow=alaw
port=5060
Then you need to edit extensions.conf
[intenal]
exten => _9X.,1,Dial(SIP/${EXTEN}@siptrunk)
For Username and password based authentication
[siptrunk]
type=friend
username=test
fromuser=10.0.10.11
host=10.0.10.25
canreinvite=no
secret=
qualify=no
dtmfmode=RFC2833
context=intenal
disallow=all
allow=g729
allow=ulaw
allow=alaw
port=5060
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