[asterisk-r2] Protocol Error with TELMEX

[Moises Silva]

I used to see this under heavy load on my early testing and that's why I
added mf_threshold timer, mostly for development. The error means we got a
MF tone, and then immediately another MF tone without any silence in the
middle, which is a violation of th MF R2 protocol. I have 2 hypothesis for
this:

1. The server is too slow (or Asterisk sometimes is too slow and drops audio
coming from the board and therefore MF tones)
2. Hardware/cabling problems that cause audio to be dropped sometimes.
3. Noise in the line (I am not a hardware guy, so I may be talking nonsense
here, but bad grounding may be a cause? )

You can try adding mf_threshold=50 in r2proto.conf advanced configuration
file ( google that, probably I already explained how to do it ). That may
help but is not going to fix the root cause.

-- 
Moises Silva
Senior Software Engineer
Sangoma Technologies Inc. | 50 McIntosh Drive, Suite 120, Markham ON L3R 9T3
Canada
t. 1 905 474 1990 x 128 | e. moy at sangoma.com

On Thu, Dec 10, 2009 at 12:02 PM, Alvaro Parres <aparres at gmail.com> wrote:

> Hi list, i have one client that change from Axtel to Telmex, and since
> the change i'm having the next error con console (not always, but some
> times).
>
> [Dec  8 09:08:57] ERROR[13358]: chan_dahdi.c:1272 dahdi_r2_write_log:
> Chan 7 - Broken MF sequence got 5 but never got tone off for tone 0!
> [Dec  8 09:08:57] ERROR[13358]: chan_dahdi.c:1272 dahdi_r2_write_log:
> Chan 7 - Protocol error. Reason = Broken MF Sequence, R2 State = Seize
> ACK Transmitted, MF state = DNIS Request Transmitted, MF Group =
> Backward Group A, CAS = 0x00
> DNIS = 00, ANI = , MF = 0x30
> [Dec  8 09:08:57] ERROR[13358]: chan_dahdi.c:1034
> dahdi_r2_on_protocol_error: MFC/R2 protocol error on chan 7: Broken MF
> Sequence
> [Dec  8 09:09:08] NOTICE[13358]: chan_dahdi.c:1295
> dahdi_r2_on_line_idle: Far end unblocked on chan 7
>
> if i made a mfr2 show channels i get:
>
> han Variant Max ANI Max DNIS ANI First Immediate Accept Tx CAS   Rx CAS
>   1 MX      10      4        No        No               IDLE     FORCED R
>   2 MX      10      4        No        No               IDLE     FORCED R
>   3 MX      10      4        No        No               IDLE     FORCED R
>   4 MX      10      4        No        No               IDLE     FORCED R
>   5 MX      10      4        No        No               IDLE     FORCED R
>   6 MX      10      4        No        No               IDLE     FORCED R
>   7 MX      10      4        No        No               IDLE     FORCED R
>   8 MX      10      4        No        No               IDLE     FORCED R
>   9 MX      10      4        No        No               IDLE     FORCED R
>  10 MX      10      4        No        No               IDLE     FORCED R
>  11 MX      10      4        No        No               IDLE     FORCED R
>  12 MX      10      4        No        No               IDLE     FORCED R
>  13 MX      10      4        No        No               IDLE     FORCED R
>  14 MX      10      4        No        No               IDLE     FORCED R
>  15 MX      10      4        No        No               IDLE     FORCED R
>  17 MX      10      4        No        No               IDLE     FORCED R
>  18 MX      10      4        No        No               IDLE     IDLE
>  19 MX      10      4        No        No               IDLE     FORCED R
>  20 MX      10      4        No        No               ANSWER   SEIZE
>
>
> The main problem, is that sometimes, i can't get any trunk for dial
> out or some time i get busy tone when dialing in.
>
> (this is the only client with this problem, i have other clients with
> telmex and don't have this problem).
>
> Thanks.
>
>
> --
> Alvaro I. Parres Peredo
>  Director de IT
>  Grupo Xmarts SA de CV
>  Tel: +52 (33) 35 63 6261 Ext. 112
>      01 800  087 2260
>  Cel: +52 (33) 33 68 1087
>  alvaro.parres at xmarts.com.mx
>
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