[asterisk-users] R2 error Seize Timeout

[Carlos Chavez]

     Last month we switched a Panasonic pbx with a Freepbx 16 
appliance.  We use a single E1 in MFC/R2 (Mexico) with Telmex as a 
provider.  This was connected for a couple of days for testing with no 
problems before the client moved offices to a new location.  In the new 
location we are now having a problem every few days where we get the 
following error:

[2022-03-07 07:30:11] ERROR[3469][C-0000004c] chan_dahdi.c: Chan 10 - 
Protocol error. Reason = Seize Timeout, R2 State = Seize Transmitted, MF 
state = MF Engine Off, MF Group = Forward MF init, CAS = 0x08
[2022-03-07 07:30:44] ERROR[29573] chan_dahdi.c: Chan 10 - Protocol 
error. Reason = Seize Timeout, R2 State = Clear Forward Transmitted, MF 
state = MF Engine Off, MF Group = Forward MF init, CAS = 0x08
[2022-03-07 07:32:15] ERROR[3704][C-0000004e] chan_dahdi.c: Chan 10 - 
Protocol error. Reason = Seize Timeout, R2 State = Seize Transmitted, MF 
state = MF Engine Off, MF Group = Forward MF init, CAS = 0x08
[2022-03-07 07:32:52] ERROR[29573] chan_dahdi.c: Chan 10 - Protocol 
error. Reason = Seize Timeout, R2 State = Clear Forward Transmitted, MF 
state = MF Engine Off, MF Group = Forward MF init, CAS = 0x08

     When we see that error the E1 will no longer send or receive 
calls.  Our solution has been to stop and restart Asterisk and 
Wanconfig/Dahdi to restore service.  Since restarting solves it I am 
wondering if the problem is on my side and not on the providers.  So far 
it happens once or twice a week.  When we report this to the provider 
they simply state that the problem is on our side (it is their default 
position) unless we can provide evidence to the contrary.  Any 
recommendations on how to debug this?

Here is wanpipe1.conf:
[devices]
wanpipe1 = WAN_AFT_TE1, Comment

[interfaces]
w1g1 = wanpipe1, , TDM_VOICE, Comment

[wanpipe1]
CARD_TYPE     = AFT
S514CPU     = A
CommPort     = PRI
AUTO_PCISLOT     = NO
PCISLOT     = 4
PCIBUS      = 8
FE_MEDIA    = E1
FE_LCODE    = HDB3
FE_FRAME    = NCRC4
FE_LINE        = 1
TE_CLOCK     = NORMAL
TE_REF_CLOCK    = 0
TE_SIG_MODE     = CCS
TE_HIGHIMPEDANCE    = NO
TE_RX_SLEVEL    = 430
HW_RJ45_PORT_MAP = DEFAULT
LBO         = 120OH
FE_TXTRISTATE    = NO
MTU         = 1500
UDPPORT        = 9000
TTL        = 255
IGNORE_FRONT_END    = NO
TDMV_SPAN        = 1
TDMV_DCHAN        = 16
TE_AIS_MAINTENANCE = NO         #NO: defualt  YES: Start port in AIS 
Blue Alarm and keep line down
                                 #wanpipemon -i w1g1 -c Ttx_ais_off to 
disable AIS maintenance mode
                                 #wanpipemon -i w1g1 -c Ttx_ais_on to 
enable AIS maintenance mode
TDMV_HW_DTMF        = NO        # YES: receive dtmf events from hardware
TDMV_HW_FAX_DETECT        = NO        # YES: receive fax 1100hz events 
from hardware
HWEC_OPERATION_MODE     = OCT_NORMAL    # OCT_NORMAL: echo cancelation 
enabled with nlp (default)
                                         # OCT_SPEECH: improves software 
tone detection by disabling NLP (echo possible)
                                         # OCT_NO_ECHO:disables echo 
cancelation but allows VQE/tone functions.
HWEC_DTMF_REMOVAL       = NO    # NO: default  YES: remove dtmf out of 
incoming media (must have hwdtmf enabled)
HWEC_NOISE_REDUCTION    = NO    # NO: default  YES: reduces noise on the 
line - could break fax
HWEC_ACUSTIC_ECHO       = NO    # NO: default  YES: enables acustic echo 
cancelation
HWEC_NLP_DISABLE        = NO    # NO: default  YES: guarantees software 
tone detection (possible echo)
HWEC_TX_AUTO_GAIN       = 0     # 0: disable   -40-0: default tx audio 
level to be maintained (-20 default)
HWEC_RX_AUTO_GAIN       = 0     # 0: disable   -40-0: default tx audio 
level to be maintained (-20 default)
HWEC_TX_GAIN            = 0        # 0: disable   -24-24: db values to 
be applied to tx signal
HWEC_RX_GAIN            = 0        # 0: disable   -24-24: db values to 
be applied to tx signal

[w1g1]
ACTIVE_CH    = ALL
TDMV_HWEC    = NO
MTU         = 8

     Here is system.conf

span=1,1,0,CAS,HDB3
cas=1-10,11-15,17-31:1101
echocanceller=oslec,1-10,11-15,17-31
loadzone=mx
defaultzone=mx

     Here is chan_dahdi.conf

signalling=mfcr2
mfcr2_variant=mx
mfcr2_get_ani_first=no
mfcr2_max_ani=10
mfcr2_max_dnis=4
mfcr2_category=national_priority_subscriber
mfcr2_call_files=no
mfcr2_mfback_timeout=-1
mfcr2_metering_pulse_timeout=-1
mfcr2_allow_collect_calls=yes
mfcr2_double_answer=no
mfcr2_immediate_accept=no
mfcr2_accept_on_offer=yes
mfcr2_skip_category=no
mfcr2_forced_release=no
mfcr2_charge_calls=yes
group=0
context=from-digital
channel=>1-10

-- 
Telecomunicaciones Abiertas de México S.A. de C.V.
Carlos Chávez
+52 (55)8116-9161