[asterisk-users] digium fax: can't indicate condition 19?

[sean darcy]

In my attempts to set up digium fax I get an odd warning:

     -- Executing [s at Capture-Fax:2] ReceiveFAX("SIP/173-b53023e8", 
"/var/spool/asterisk/fax/20090921_1806.tif") in new stack
     -- Channel 'SIP/173-b53023e8' receiving fax 
'/var/spool/asterisk/fax/20090921_1806.tif'
[Sep 21 18:06:37] WARNING[5149]: chan_sip.c:5561 sip_indicate: Don't 
know how to indicate condition 19
     -- Channel 'SIP/173-b53023e8' fax session '7' started

Is there some list of these conditions? Should I care?

sean