asterisk users - Oct 2012 - WARNING T.30 ECM carrier not found

I'm working on setting up incoming fax reception on our * server. The
majority of faxes come through fine. However each timed a fax comes
in, I get a bunch of this:

WARNING[6616]: res_fax_spandsp.c:416 spandsp_log: WARNING T.30 ECM
carrier not found

Should this be of concern to me? A snip of the log is below.

Kind Regards,
Chris


    -- Executing [19108929322 at from-trunk:6]
Set("SIP/foobar_trunk_did_b-00000174",
"CALLERPRES()=allowed_not_screened") in new stack
    -- Executing [19108929322 at from-trunk:7]
Set("SIP/foobar_trunk_did_b-00000174",
"FAX_DEST=ext-fax^166^1") in
new stack
    -- Executing [19108929322 at from-trunk:8]
Answer("SIP/foobar_trunk_did_b-00000174", "") in new stack
    -- Executing [19108929322 at from-trunk:9]
Wait("SIP/foobar_trunk_did_b-00000174", "4") in new stack
  == Redirecting 'SIP/foobar_trunk_did_b-00000174' to fax extension
due to CNG detection
  == Spawn extension (from-trunk, fax, 1) exited non-zero on
'SIP/foobar_trunk_did_b-00000174'
    -- Executing [fax at from-trunk:1]
Goto("SIP/foobar_trunk_did_b-00000174", "ext-fax,166,1") in
new stack
    -- Goto (ext-fax,166,1)
    -- Executing [166 at ext-fax:1]
Set("SIP/foobar_trunk_did_b-00000174", "FAX_FOR=Fax (166)")
in new
stack
    -- Executing [166 at ext-fax:2]
NoOp("SIP/foobar_trunk_did_b-00000174", "Receiving Fax for: Fax
(166),
From: "+18009806858" <+18009806858>") in new stack
    -- Executing [166 at ext-fax:3]
Set("SIP/foobar_trunk_did_b-00000174", "FAX_RX_EMAIL=fax at
foobar.com")
in new stack
    -- Executing [166 at ext-fax:4]
Goto("SIP/foobar_trunk_did_b-00000174", "s,receivefax") in
new stack
    -- Goto (ext-fax,s,3)
    -- Executing [s at ext-fax:3]
StopPlayTones("SIP/foobar_trunk_did_b-00000174", "") in new
stack
    -- Executing [s at ext-fax:4]
ReceiveFAX("SIP/foobar_trunk_did_b-00000174",
"/var/spool/asterisk/fax/1349791968.502.tif,f") in new stack
    -- Channel 'SIP/foobar_trunk_did_b-00000174' receiving FAX
'/var/spool/asterisk/fax/1349791968.502.tif'
[2012-10-09 10:13:03] WARNING[6616]: res_fax_spandsp.c:416
spandsp_log: WARNING T.30 ECM carrier not found
[2012-10-09 10:13:04] WARNING[6616]: res_fax_spandsp.c:416
spandsp_log: WARNING T.30 ECM carrier not found
[2012-10-09 10:13:04] WARNING[6616]: res_fax_spandsp.c:416
spandsp_log: WARNING T.30 ECM carrier not found
[2012-10-09 10:13:24] WARNING[6616]: res_fax_spandsp.c:416
spandsp_log: WARNING T.30 ECM carrier not found
[2012-10-09 10:13:24] WARNING[6616]: res_fax_spandsp.c:416
spandsp_log: WARNING T.30 ECM carrier not found
[2012-10-09 10:14:07] WARNING[6616]: res_fax_spandsp.c:416
spandsp_log: WARNING T.30 ECM carrier not found
[2012-10-09 10:14:07] WARNING[6616]: res_fax_spandsp.c:416
spandsp_log: WARNING T.30 ECM carrier not found
[2012-10-09 10:14:20] WARNING[6616]: res_fax_spandsp.c:416
spandsp_log: WARNING T.30 ECM carrier not found
[2012-10-09 10:14:20] WARNING[6616]: res_fax_spandsp.c:416
spandsp_log: WARNING T.30 ECM carrier not found
pbx1*CLI>