Re: [Asterisk-Users] prevent callerid spoofing between asterisks

[Sean Kennedy]

elkur wrote:
Hi all
For example here is asterisk-A sip.conf:
[123456]
type=friend
secret=xxyyzz
nat=1
qualify=100
host=dynamic
canreinvite=no
callerid="" <123456>
context=sipphone
dtmfmode=rfc2833
Sip-phone can make and receive calls and callerid 
value overrides phones config here, thats nice.

OK, lets set up an Asterisk-B as sip peer and also send all our
outgoing traffic to Asterisk-A, useing same the sip account.
#Asterisk-B sip.conf:
register => 123456:[EMAIL PROTECTED]
[asteriskA]
type=friend
username=123456
secret=xxyyzz
host=ip.adr.of.asteriskA
#Asterisk-B extensions.conf:
exten => _XXX.,1,Dial(SIP/asteriskA/${EXTEN})
Now if I make a call from asterisk-B to asterisk-A, I'm able 
to spoof callerid, because in this case asterisk-A doesn't 
override callerid. How to prevent that?

Thanks.
Elku
Setup the dialplan on the "protected" * server to manually set the 
callerid.  That will over ride any value sent to it by the remote * server.
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