Re: [asterisk-users] low success rate for ReceiveFax

[Steve Underwood]

On 06/26/2012 11:47 AM, Roi Stork wrote:
In what way was my question not meaningful? Not enough details?
Enoughj? You didn't give any.
Here's our current receive fax route:
sender fax machine -> telco -> E1 line -> sangoma card -> asterisk
We're currently using free fax for asterisk.
This constitutes a meaningful question.

I have read that fax over voip is not reliable, but is it the same
case for faxes going through dahdi channels?
It's strange because I previously tested using another asterisk server
to send fax using SIP to the receiving server above, and the
completion rate is better than using an actual fax machine.
With a direct PSTN connection like that a success rate of 99% should be 
considered very bad. The log below suggests you have hiccups on the 
audio, and the single commonest reason for that in a setup like yours is 
you are not sourcing the clock for your Sangoma card's E1 interface from 
the PSTN.

Steve

>From the asterisk console I can see the receiving fax session running,
but halfway it stops due to timeout or hangup.
Below is a fax session output which was marked as failed:


-- Channel 'DAHDI/i1/-4' receiving FAX
'/var/spool/asterisk/fax/fax-65126150-1340338724-rx.tif'

-- Channel 'DAHDI/i1/-4' FAX session '0' started

-- FAX handle 0: [ 000.000051 ], STAT_EVT_STRT_RX st: IDLE rt: IDLENSRX

-- FAX handle 0: [ 000.000098 ], STAT_EVT_RX_HW_RDY st: WT_RX_HW_RDY
rt: RRDYNHRY

-- FAX handle 0: [ 000.000129 ], P30EVN_RECEIVE_STARTED

-- FAX handle 0: [ 000.000148 ], STAT_INFO_CSI

-- FAX handle 0: [ 000.000174 ], STAT_INFO_DIS

Channel 'DAHDI/i1/-4' fax session '0', [ 000.079050 ], channel sent 3 frames 
(60 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 000.093757 ], stack sent 4 frames (80 
ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 000.153752 ], stack sent 3 frames (60 
ms) of silence.
Channel 'DAHDI/i1/-4' fax session '0', [ 000.459077 ], channel sent 19 frames 
(380 ms) of silence.
Channel 'DAHDI/i1/-4' fax session '0', [ 003.154772 ], stack sent 150 frames 
(3000 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 003.199289 ], channel sent 137 frames 
(2740 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 003.211770 ], stack sent 3 frames (60 
ms) of silence.
Channel 'DAHDI/i1/-4' fax session '0', [ 003.259286 ], channel sent 3 frames 
(60 ms) of silence.
-- FAX handle 0: [ 005.250881 ], STAT_EVT_TX_V21_DONE st: WT_DIS_RSP
rt: WDSRNT21

Channel 'DAHDI/i1/-4' fax session '0', [ 005.571646 ], stack sent 118 frames 
(2360 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 005.599474 ], channel sent 117 frames 
(2340 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 005.799493 ], channel sent 10 frames 
(200 ms) of silence.
-- FAX handle 0: [ 007.213920 ], STAT_INFO_DCS

-- FAX handle 0: [ 007.213946 ], STAT_EVT_DCS st: WT_DIS_RSP rt: WDSRNDCS

-- FAX handle 0: [ 007.213969 ], STAT_NEG_V29_9600

-- FAX handle 0: [ 007.213983 ], STAT_NEG_MMR

-- FAX handle 0: [ 007.213995 ], STAT_NEG_A4

-- FAX handle 0: [ 007.214007 ], STAT_NEG_RES_204x98

-- FAX handle 0: [ 007.214019 ], STAT_NEG_ECM

-- FAX handle 0: [ 007.214031 ], STAT_EVT_SW_ECM st: WT_DIS_RSP rt: WDSRNSWE

Channel 'DAHDI/i1/-4' fax session '0', [ 007.279603 ], channel sent 74 frames 
(1480 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 007.439604 ], channel sent 8 frames 
(160 ms) of silence.
-- FAX handle 0: [ 007.553962 ], STAT_EVT_RX_IMG_STRT st: RCV_ECM_TRN
rt: UNEXPECT

Channel 'DAHDI/i1/-4' fax session '0', [ 009.219725 ], channel sent 89 frames 
(1780 ms) of energy.
-- FAX handle 0: [ 009.253979 ], STAT_EVT_RX_TRN_END st: RCV_ECM_TRN
rt: RTCFNERT

-- FAX handle 0: [ 009.254005 ], STAT_FRM_CFR

Channel 'DAHDI/i1/-4' fax session '0', [ 009.414674 ], stack sent 192 frames 
(3840 ms) of silence.
Channel 'DAHDI/i1/-4' fax session '0', [ 009.459747 ], channel sent 12 frames 
(240 ms) of silence.
-- FAX handle 0: [ 010.439088 ], STAT_EVT_TX_V21_DONE st: RCV_ECM_STRT
rt: RECMNT21

Channel 'DAHDI/i1/-4' fax session '0', [ 010.772670 ], stack sent 68 frames 
(1360 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 010.799850 ], channel sent 67 frames 
(1340 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 011.019872 ], channel sent 11 frames 
(220 ms) of silence.
-- FAX handle 0: [ 011.132976 ], STAT_EVT_RX_IMG_STRT st: RCV_ECM_STRT
rt: RECMNSRI

-- FAX handle 0: [ 011.133002 ], P30EVN_PHASE_C

-- FAX handle 0: [ 011.133018 ], P30EVN_DOC_START

-- FAX handle 0: [ 011.133049 ], P30EVN_PAGE_START

Channel 'DAHDI/i1/-4' fax session '0', [ 014.740131 ], channel sent 186 frames 
(3720 ms) of energy.
-- FAX handle 0: [ 014.812946 ], STAT_EVT_RX_IMG_END st: RCV_ECM rt: RECMNERI

Channel 'DAHDI/i1/-4' fax session '0', [ 014.860152 ], channel sent 6 frames 
(120 ms) of silence.
-- FAX handle 0: [ 016.273967 ], STAT_INFO_PPS_EOP

-- FAX handle 0: [ 016.273993 ], STAT_EVT_PPS_EOP st: F_END_ECM rt: FEEMNP_P

-- FAX handle 0: [ 016.274055 ], P30EVN_PAGE_END

-- FAX handle 0: [ 016.274071 ], P30EVN_DOC_END

-- FAX handle 0: [ 016.274086 ], STAT_FRM_MCF

Channel 'DAHDI/i1/-4' fax session '0', [ 016.340258 ], channel sent 74 frames 
(1480 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 016.434711 ], stack sent 283 frames 
(5660 ms) of silence.
Channel 'DAHDI/i1/-4' fax session '0', [ 016.480280 ], channel sent 7 frames 
(140 ms) of silence.
-- FAX handle 0: [ 017.459594 ], STAT_EVT_TX_V21_DONE st: F_END_ECM rt: FECMNFCS

Channel 'DAHDI/i1/-4' fax session '0', [ 017.793706 ], stack sent 68 frames 
(1360 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 017.820355 ], channel sent 67 frames 
(1340 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 018.020382 ], channel sent 10 frames 
(200 ms) of silence.
Channel 'DAHDI/i1/-4' fax session '0', [ 019.400471 ], channel sent 69 frames 
(1380 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 019.420496 ], channel sent 1 frames 
(20 ms) of silence.
Channel 'DAHDI/i1/-4' fax session '0', [ 019.460489 ], channel sent 2 frames 
(40 ms) of energy.
Channel 'DAHDI/i1/-4' fax session '0', [ 019.780498 ], channel sent 16 frames 
(320 ms) of silence.
Channel 'DAHDI/i1/-4' fax session '0', [ 019.820519 ], channel sent 2 frames 
(40 ms) of energy.
-- Span 1: Channel 0/7 got hangup request, cause 16

-- FAX handle 0: [ 019.879779 ], STAT_EVT_TMR_INT_EXP st: F_END_ECM rt: XXXXNTIX

-- FAX handle 0: [ 022.382966 ], STAT_EVT_HW_CLOSE st: WT_HW_CLS rt: WCLSNCLS

-- FAX handle 0: [ 022.383063 ], STAT_SES_COMPLETE

-- FAX handle 0: [ 022.383083 ], P30EVN_COMPLETE

== Spawn extension (fax-rx, receive, 19) exited non-zero on 'DAHDI/i1/-4'



On Fri, Jun 22, 2012 at 12:25 PM, Steve Underwood <ste...@coppice.org> wrote:
On 06/22/2012 11:58 AM, Roi Stork wrote:
Hi,

Im able to send faxes with no errors, but the success rate for the
receiving side is less than 50%.

Asterisk usually returns records these errors as partial fax and fax
protocol error.

A lot of the error values returned by FAXOPT are 3RD_T2_TIMEOUT and
T2_TIMEOUT.

Any suggestions on how to improve the fax receiving rate?

"I have a problem. Can you fix it?" is not really a meaningful question.

Steve



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