TRIXBOX, connecting an sip phone over wan using sip?

You need to setup the extension first in your sip.conf (this can be found in /etc/asterisk on linux). In the file you will create something like this that defines the parameters of your extension and device:


[123] ; this is your extension number
context=to-callcentric ;this defines what context OUTBOUND calls from this device are handled by (defined in extensions.conf)
type=friend ; this defines the type of connection
secret=1234 ; this is the password for your extension
qualify=yes
port=5060 ; the port SIP requests should be answered on
nat=yes ; are you traversing nat?
mailbox=123@default ; corresponds to your voicemailbox as defined in voicemail.conf
host=dynamic ; the type of host your device is
dtmfmode=rfc2833 ; keytone modes typically leave it at this setting
dial=SIP/123 ;
canreinvite=no;
callerid=device <123> ;your devices caller id


For more information also check out this link, it is as close to a complete asterisk users guide as you will get, and its FREE and published by O'Reilly. I highly recommend it.

http://www.nufone.net/downloads/asteriskdocs/AsteriskTFOT.zip

Hope this helps.