asterisk users - Jan 2006 - Problem with rxfax - Dropping incompatible voice frame?

Hi,

I'm having problems with the rxFax app.  One of the messages that appear in
my console is:
Executing Set("SIP/something",
"FAXFILE=/var/spool/asterisk-fax/1137692307.5.tif") in new stack
    -- Executing RxFAX("SIP/something",
"/var/spool/asterisk-fax/1137692307.5.tif") in new stack
Jan 19 12:38:30 NOTICE[12008]: channel.c:1906 ast_read: Dropping
incompatible voice frame on SIP/something of format slin since our native
format has changed to ulaw

"Dropping incompatible voice frame on SIP/something of format slin since
our
native format has changed to ulaw"

This seemed particularly important, but I can't really say why....Could this
be why my faxes are often interrupting during transmission and giving me
errors on my PSTN fax machine that is used for sending the fax?

Mike

On Thu, 19 Jan 2006, [iso-8859-1] Micha?l Gaudette wrote:
> Executing Set("SIP/something",
> "FAXFILE=/var/spool/asterisk-fax/1137692307.5.tif") in new stack
>     -- Executing RxFAX("SIP/something",
> "/var/spool/asterisk-fax/1137692307.5.tif") in new stack
> Jan 19 12:38:30 NOTICE[12008]: channel.c:1906 ast_read: Dropping
> incompatible voice frame on SIP/something of format slin since our native
> format has changed to ulaw
FAXing doesn't work over Voice-over-IP channels.  Or, hardly ever works.  
Or, works occasionally but unreliably.  Check the spandsp FAQ.

Steve