Hi everyone.
I am tring to detect a special tone using lucent modem.
The reason I choose lucent is because I read lucent modem can
detect a special tone in its manual.
The special tone is CAS(CPE Alerting Signal) tone
which 2130hz and 2750hz are mixed like DTMF tones.
I carefully searched many modem-chip maker's AT-command manuals.
And finally I found that lucent chips can detect CAS tone!!!
( You can check it at 47page in here
=>http://www.vee90.net/atcom/LT/v90atcom.pdf )

Actually I bought a lucent modem which can support a voice mode and I tested
it like this.
1. Run terminal
2. ATZ : initialize the modem
3. AT+CLASS=8 : set the modem to voice mode
4. ATS0=1 : answer after first ring ( because CAS tone will be sent after
first ring )
5. I send a SMS message to my computer using my cell phone.
6. I can hear a ring.
7. My computer show me trashy characters following R, which mean a ring.
8. It answer. Then there is short sound (Yes. It is CAS tone.)
9. And no "@" character is shown!!! ( which mean my modem didn't detect a
CAS tone. )
10. When I pushed some button in my cell phone, for example 9,
I could see trashy characters following 9 digit. ( which mean my modem
detect a DTMF tone.)

I want to know whether my lucent modem can detect CAS tone or not.
And where should I contact for this problem? I sent a email to Agere
company.
But no answer.

Now I feel so bad becase I don't think I explained my problem in detail.
I should study english first.