Re: [hylafax-users] False "Busy signal detected" error

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Mark Hellman wrote:

> I got in touch with Linuxant and they suggested I use "AT X1" as an
> initialization string, which disables busy signal detection.
>
> This indeed works, but I am wondering if this is harmless to Hylafax. Does
> Hylafax relies on busy signal detection to prevent, for instance, trying to
> send a fax while another fax is being received? Or does Hylafax has other
> mechanisms to prevent send/receive overlapping?

Disabling BUSY signal detection is only going to affect the result of 
the ATD command.  I would expect, then, that the modem will eventually 
report NO CARRIER instead of BUSY for truly busy calls.

What that means is that you no longer are capable of detecting busy 
signals, and so all of the rules that apply to NO CARRIER results 
(NoCarrierRetries, for example) are used for busy signals as well.  The 
basic effect on default installations will be that fewer attempts to 
busy destinations will be made unless the destination is known (by the 
info file) to actually have a fax machine there.

For the most part following Linuxant's suggestion should be safe.  It's 
disappointing, however, that Linuxant does not indicate whether they are 
going to fix it, not fix it, or if it cannot be fixed due to chipset 
(DSP) problems.

Lee.


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