[Freeswitch-users] Help with rxfax debug "T4 expires in phase T30_PHASE_B_RX"

[Sadhika Sharma]

Hi,

I need help in debugging hangup cause 548, 'Disconnected after permitted
retries' while attempting rxfax().

Logs show that T4 expires in phase T30_PHASE_B_RX.
T30 PHASE B concerns exchange of DIS/DCS messages. After sending DIS, mod
spandsp keeps waiting for DCS and exhausts its retries.

Please guide me how to debug the root cause of loss of DCS message. Logs are
mentioned below:

2011-03-07 15:53:48.675180 [DEBUG] switch_ivr.c:557 OpenZAP/4:1/43851609
Command Execute rxfax(/srv/fax/in/fcf15a4c-48a4-11e0-919e-7bf53bcc3f81.tiff)
2011-03-07 15:53:53.334614 [DEBUG] mod_spandsp_fax.c:293 FLOW T.30 Send
complete in phase T30_PHASE_B_TX, state 17
2011-03-07 15:53:53.335619 [DEBUG] mod_spandsp_fax.c:293 FLOW T.30 DIS:
2011-03-07 15:53:53.335619 [DEBUG] mod_spandsp_fax.c:293 FLOW T.30   ....
...0= Store and forward Internet fax (T.37): Not set
2011-03-07 15:53:53.335619 [DEBUG] mod_spandsp_fax.c:293 FLOW T.30   ....
.0..= Real-time Internet fax (T.38): Not set
:
:
2011-03-07 15:53:53.875238 [DEBUG] mod_spandsp_fax.c:293 FLOW T.30 Start T4
2011-03-07 15:53:53.895315 [DEBUG] mod_spandsp_fax.c:293 FLOW T.30 HDLC
signal status is Carrier up (-2) in state 17
2011-03-07 15:53:53.915402 [DEBUG] mod_spandsp_fax.c:293 FLOW T.30 HDLC
signal status is Carrier down (-1) in state 17
2011-03-07 15:53:57.335032 [DEBUG] mod_spandsp_fax.c:293 FLOW T.30 T4
expired in phase T30_PHASE_B_RX, state 17
2011-03-07 15:53:57.335032 [DEBUG] mod_spandsp_fax.c:293 FLOW T.30 Retry
number 1


Please guide me how to debug the root cause of loss of DCS message.
Thanks,
Sadhika
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