This post strongly suggests (implies!) that the dial plan may need to be tinkered with. Which is where your original command needs to be used. The dial plan should be in extensions.conf.
To be it looks sarcastic. I apologies if i took it wrong, I wasn't the only person on here who took that the wrong way.
maybe this would be betterQuote:
In that guide you linked to where does it say to execute that command from the command line?
I cant see in the guide you linked to where it says you execute that in the command line. Mayeb you have got mixed up?
If you're using SIP phones, it's the phone that plays the dial tone and "call progress" tones - ringing, engaged, etc. To change what they sound like you need to edit the configuration for the phone - either via the web interface of the phone or via the config file the phone grabs when it boots - the method employed by the phone depends on the phone.
The settings in the Asterisk configuration file refer to occasions when Asterisk generates the tones - predominantly if you are using a hardware card to provide connectivity to analogue phones. Otherwise, Asterisk just relays the status to the SIP phone (it's ringing, it's engaged) and the SIP phone makes whatever noise it sees fit.
Hope this helps!