My extension.conf i have this in the last line of extension.conf

[testvoip]
exten => _1.,1,Dial(SIP/${EXTEN}@ipofprovider,,r)

my sip.conf
[general]
context=default
port=6060
bindaddr=0.0.0.0
callerid=No CallID
disallow=allow
allow=g729

[testvoip]
context=testvoip
type=peer
host=ipofprovider
rtptimeout=60
disallow=all
allow=g729

my ser.cfg
if (method == "INVITE") {
    if (uri =~ "sip:1[0-9]{10}@*"){
        log(1, "Forwarding to Asterisk\n");
        rewritehostport("202.202.202.202:6060");
        t_relay();
        break;
    }
 }