"all circuits busy" message instead of busy signal when calling busy phone

[jarvisswope (computerguy2907)]

Replacing "all circuits are busy now" with actual tones

Hi, Does anybody know how I can replace the “all circuits are busy now” message with the country tone of the condition. As example, we often test numbers to see if they are disconnected. Our sip provider returns a “404” (from memory) for this. They return a different code for the busy numbers, yet my users get the same message for both. It would make sense to just return the tone, as most users knows the tones. Thanks !