send a Voice message before sending a fax?

winson97

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#1
send a Voice message before sending a fax

I mean in normal conditions when you want to send a fax you have to
call them and ask for fax tone so you can send a fax , I was wondering
if it is possible to send a voice message asking for fax tone ( a wav
file for example)before sending a FAX ??? .
 

winson97

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#2
CNG

This signal may be sent from the Originating FAX machine after dialing is complete. The CNG signal consists of the transmission of 1100 Hz for 1/2 second, followed by a 3 second silent (2100 Hz OFF) period.

The CNG signal can alert the answering user (misdialed number, manual FAX operation) of connection to a FAX machine
 

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