Line out of service message

[tone-the-phone]

I ran CCS trace one of our switches and noticed the following line

10:31:21 RI62 DAS 1A CRM/CIM ;9;*AA*LINE OUT OF SERVICE#

I checked the state of the trunk and it reports idle or busy with a call in progress.  Has anyone seen this and can explain why it should do this, I haven't seen it before.  Other trunks on this card show the same message but all trunks continue to take calls.
The system is MS2009 F-UK-00 edition SX.Q23.2.5

[ralph]

10:31:21 RI62 DAS 1A CRM/CIM ;9;*AA*LINE OUT OF SERVICE#

Interesting.   The "RI62" tells me this is an incoming message from the carrier.   


Ralph