How to make asterisk make calls through proxy?

Now I registered my asterisk to the vbuuzer.com. Then I use another phone registered with vbuzzer zccount to call asterisk’s extension. But asterisk returned with 404.

sip.conf
[general]
register => zccount:passwor@vbuzzer.com:80/4119

[vbuzzer.com]
type=friend
secret=passowrd
username=account
host=vbuzzer.com

extensions.conf
exten=>4119,1,dial(sip/4119)

Is there any problem?

when a phone call asterisk with vbuzzer account number,asterisk answered with 404 not found