Don't *ever* ring and say you are testing, they will not love you at all
for doing that..!
I don't know Asterisk but I would assume if you connect something to the
analogue line connection and listen for the DTMF tones being sent you
should get some idea.
Ivor
You should arrange the test call with your provider. Are you routing
999 calls over a PSTN line? If so, you might be better off using 150 a
dummy 999 number or something. Certainly, as someone else has
suggested, dialling 999 and saying, "sorry mate, testing, testing, 123"
== bad.
alex