[hylafax-users] Conclusion: Damn! Hylafax, Multitech, and distinctive ring

[George Bell <gbell5@cox.net>]

Through several sessions with minicom and my cell-phone, I have found 
that the ring patterns reported by the modem for the fax number, with  
AT+VDR=1,1 , are(with perhaps exceptions at the very begining and 
excluding any caller id information)

DRON=8
RING
DRON=4
DRON=8
RING
DROF=40

repeat....

While for my normal voice number

DRON=20
RING
DROF=40

repeat...

As stated in my ealier post, I could not directly make use of the 
Distinctive Ring Report feature of the multitech modem in Hylafax to 
route the calls.  However, I could take advantage of the fact that with 
AT+VDR=1,0 or 1,1 the "RING" signals occur twice as frequently for the 
fax number as for the voice number.  ( I doubt that tweaking the second 
parameter(0-255) would help much since it just increases the delay 
between the first ring signal and the  report).    This means that a 
call from a fax number becomes answered in less time than from a voice 
number, for the same amount of rings.   Note this only works with 
AT+VDR=1,0.  If the default AT+VDR=0,0 is used, then the frequencies are 
the same.   Furthermore, just by luck, it appears Hylafax adds another 
two rings for the ring count for the voice number, while not for the fax 
number ( Guess - because I am using Caller ID and the Caller ID 
information disrupts the counting of the rings? )  Anyway, I found a 
value of "RingsBeforeAnswer" = 4 optimal.  Fax calls get answered in 
less than two voice ring times, while voice calls aren't answered until 
9 rings!    I found some more data on this:

RingsBeforeAnswer = 4      Actual No of Voice Phone rings before ATA:  7
                                      6                                 
                                                 9

I am hoping this will work well with another process vgetty, to answer 
the voice line before Faxgetty gets the chance to answer the line.   (It 
will work best if vgetty counts the rings "better" ).  Anyway, I'll see 
about that part tomorrow.


George



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