Re: [hylafax-users] MultiModemDID not handshaking

["Darren Nickerson" <darren.nickerson@xxxxxxxx>]

"Lee Howard" <faxguy@xxxxxxxxxxxxxxxx> wrote:

> Todd Jetzer wrote:
>
> > I have been running Hylafax for about 6 months using 2 analog modems and 
> > it has been working pretty well.   I have since installed an analog DID 
> > tunk and a Multitech MulitModemDID.  I am unable to get a fax to connect 
> > to the Multimodem.  The dialing fax will start to connect to the modem 
> > but it will die out during handshaking.  Can anyone make any suggestions 
> > as to what I need to do to fix this?
>
>
> Does it produce a session log?  If so, what does the session log say?
>
> In all of my analog DID installations the one thing that seems to always 
> be in-doubt is the polarity on the DID line.  You may want to try 
> reversing the wires.  However, there is an AT command to do that, also, I 
> think.

That extremely useful but poorly documented function is AT*DP#, where the # 
can be either 0 which is the default polarity or 1 which will reverse the 
polarity. We find it's required in rougly 50% of MultiModemDID 
installations.

-Darren 


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