[asterisk-r2] MF back cycle timed out!

[Agustina Berretta]

Hello

I have FreePBX 2.8 and asterisk 1.6.2.10 and using an R2 connection to the
PSTN.
It was working fine for a couple of months but yesterday a problem ocurred:
from 10 calls only 9 entered the PBX.

I checked dahdi status and was fine.
I see the following messages in the log, and don´t know if it means a
problem:

[Feb  7 13:43:27] WARNING[3092] chan_dahdi.c: Chan 33 - MF back cycle timed
out!
[Feb  7 13:43:27] ERROR[3092] chan_dahdi.c: Chan 33 - Protocol error.
Reason = Multi Frequency Cycle Timeout, R2 State = Seize ACK Transmitted,
MF state = Category Request Transmitted, MF Group = Backward Group C, CAS =
0x00
DNIS = 2, ANI = , MF = 0x20
[Feb  7 13:43:27] ERROR[3092] chan_dahdi.c: MFC/R2 protocol error on chan
33: Multi Frequency Cycle Timeout

Any help will be appreciated!
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