.call file to call a phone with an extension number


I use .call files to place calls from apache. I don’t know how to call a phone number with an extension. Lets’s say 514-386-7626 extension 2241

This is how my .call file looks when I want to call 386-7626

Channel: SIP/username/15143867626
Callerid: 15149902626
Account: username
Context: sipprvd
Extension: s
Priority: 1

Thanks a lot!!!