asterisk users - Jun 2005 - PRI: XXX Missing handling for mandatory IE 12 (cs0, Connected Number) XXX

Hello list,
>From time to time, I get the following warning in my message log.
Jun 23 15:56:40 WARNING[559]: PRI: XXX Missing handling for mandatory IE 12
(cs0, Connected
Number) XXX

Should I be concerned?  To my knowledge I have not had an problems because of
it, but if
somebody can give me some information about it would be cool.

Hardware:
- Digium TE405P
Software:
- Slackware 10.0
- Asterisk 1.0.7

PB