1 TEI=0 MDL-ERROR (C): UA (F=1) in state 7(Multi-frame estab

Hi.

These two lines keep showing on the asterisk CLI but everything seems to be working:

1 TEI=0 MDL-ERROR (C): UA (F=1) in state 7(Multi-frame established) 2 TEI=0 MDL-ERROR (C): UA (F=1) in state 7(Multi-frame established)

It started as soon as I installed 2 ISDN lines in a redfone foneBRIDGE2.

What are those?

I’m using:
asterisk 1.8.4.1
dahdi 2.4.1
libpri-1.4.11.5