[asterisk-users] 1.6.1 + TDM840 FSK MWI problem

[Doug Bailey]

----- "Barry Miller" <asterisk-users at notanet.net> wrote:

> On Wed, Sep 02, 2009 at 09:44:05AM -0500, Doug Bailey wrote:
> > 
> > ----- "Barry Miller" <asterisk-users at notanet.net> wrote:
> > 
> > > Hi,
> > > 
> > > Using 1.4.26.1 & DAHDI 2.2.0.2, FSK VMWI devices off a TDM840
> work
> > > fine.
> > > 
> > > With 1.6.1.[45] & same DAHDI, instead of the FSK spill I get a
> line
> > > polarity reversal.  Stutter dialtone is generated as expected.
> > > 
> > > Has anyone else seen this?  Is there anything special I need to
> do
> > > for
> > > 1.6.1 to make FSK MWI work?
> > > 
> > 
> > The ability to do line reversal MWI was added into the 1.6.2 branch.
> 
> > Looking through the 1.6.1 code base, I don't see anything other than
> fsk 
> > MWI (with and without Ring Pulse Alert Signalling.) 
> > 
> > In any case, this is set by defining "mwisendtype" in chan_dahdi.  
> > The default for this is fsk spills.  
> > It can be set to "nofsk" if you want to disable the fsk spills. 
> > 
> > The line reversal is set by specifying 
> > mwisendtype=lrev
> > 
> > Regards,
> > Doug Bailey 
> > 
> Thanks, but that's not the problem.  I _want_ FSK.  A few ast_debug's
> in
> chan_dahdi tell me that after calling vmwi_generate(), it's taking
> the
> MWI_SEND_SPILL path through mwi_send_thread(), and happily sending
> about
> 9K bytes of spill, 160 bytes at a time.  But my phones (and a
> butt-set)
> tell me that nothing is being received.
> 

The only thing I can think of that would be preventing the output would be 
problems in the interface chip with the On-Hook transfer mode. 

If you run a dahdi_monitor on the channel that should be sending the FSK 
spill and look at the results in a program like audacity, you can see if 
the MWI FSK spill is actually reaching the interface SLIC IC. 

Something like "dahdi_monitor 1 -t spilloutput.raw" (Monitors the output 
going to dahdi channel 1.) 



> I don't understand the DAHDI ioctls very well.  Is it possible that
> the
> TDM840 is not in the correct state when the spill is transmitted?
> 
> Thanks again,
> 
> --Barry
> 
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