Qwest CallerID question re:[Asterisk-Users] Caller ID problem

[Steven J. Sobol]

On Sat, 23 Aug 2003, Ryan Tucker wrote:

> To check with a buttset, hook it up to the pair and monitor as you call in 
> from another phone.  If it's DTMF, you'll hear DTMF.  If it's FSK, you'll 
> hear a squawk much like a packet radio transmission or the data bursts you 
> hear on weather radio when a warning is issued immediately after the first 
> ring.  -rt

On my SBC phone, I used to hear a high-pitched chirp before the Call
Waiting beep (much like the first chrip of a V.90 modem negotiation tone)
when someone called in and I was on the line. Does this mean SBC was using
FSK to transmit caller ID on my line?

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