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Asterisk installation and configuration on Linux Ubuntu

Install Asterisk
sudo apt-get install asterisk
Enter your country code when prompted for.

If you have to reconfigure it again removing asterisk without other dependencies will not get rid of config files and reinstall wil not create it so be careful and try uninstalling asterisk-config if required.

Port forwarding will be required from gateway to receive calls from Registrars.

sudo vi /etc/asterisk/users.conf
callerid=CIA FBI ATF <1-555-555-5555>

sudo vi /etc/asterisk/sip.conf
add under [general] just below follwoing default line
;register =>
register => sipid:sippassword@sipgate/sipid

;localnet= ; Zero conf local network

;       ; refreshed periodically
;        externrefresh=180               ; change the refresh interval
At the bottom of file add below

sudo vi /etc/asterisk/extensions.conf
;exten => sipid,1,Dial(SIP/1000) ; <-- instead of extension you should define the corresponding peer
exten => sipid,1,Dial(SIP/77@localhost:5080) ; forward calls to Skype SIP URI
exten => sipid,n,Hangup

exten => _X.,1,Set(CALLERID(num)=sipid)
exten => _X.,2,Dial(SIP/${EXTEN}@sipgate,30,trg)
exten => _X.,3,Hangup

exten => 1000,1,Playback(demo-echotest) ; Let them know what's going on
exten => 1000,2,Echo ; Do the echo test
exten => 1000,3,Playback(demo-echodone) ; Let them know it's over

Restart Asterisk
sudo /etc/init.d/asterisk restart
Check Asterisk Status
sudo asterisk -r

sipgateway*CLI> sip show registry
Host                           dnsmgr Username       Refresh State                Reg.Time
sipgate:5060                   N      8373647367            105 Registered           Sat, 24 Sep 2011 01:04:12
1 SIP registrations.
So using above configuration we have set up a Sipgate account successfully registered on Asterisk to forward all incoming calls to Skype URI which will in turn call skype id or numbers.

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