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Fax fails over T1

I have a client who is hubbed in city A and I am provideing them dial-tone in city B via a T1 with HDLC encap.

If I push their voice/fax out over the T1 to city B voice works just fine, but fax fails 80-90% of the time? I have re-directed their fax out city A PSTN and the fax works almost 100% of the time.

Here is a debug i have from the router the fax is hooked up to.

test-1#debug vpm all

20:02:49: htsp_dsp_message: SEND/RESP_SIG_STATUS: state=0xC timestamp=63044 systime=7216938

20:02:49: htsp_process_event: [1/0, FXSLS_ONHOOK, E_DSP_SIG_1100]fxsls_onhook_offhook htsp_setup_ind

20:02:49: [1/0] get_local_station_id calling num= calling name= calling time=10/12 21:36 orig

called=

20:02:49: TGRM: reg_invoke_tgrm_accept_call(1, TGRM_CALL_VOICE, TGRM_DIRECTION_IN, 0, 1, 0, 0)

20:02:49: TGRM: Calling vtsp_tsp_call_setup_ind().

20:02:49: TGRM: reg_invoke_tgrm_call_update(0, 1, 0, 0, 1, TGRM_CALL_BUSY, TGRM_CALL_VOICE,

TGRM_DIRECTION_IN)

20:02:49: dsp_digit_collect_on: [1/0] packet_len=20 channel_id=128 packet_id=35 min_inter_delay=240

max_inter_delay=9760 mim_make_time=10 max_make_time=100 min_brake_time=10 max_brake_time=100

20:02:49: htsp_process_event: [1/0, FXSLS_WAIT_SETUP_ACK, E_HTSP_SETUP_ACK]fxsls_check_auto_call

20:02:51: htsp_digit_ready(1/0): digit = 1

20:02:51: htsp_digit_ready(1/0): digit = 6

20:02:52: htsp_digit_ready(1/0): digit = 0

20:02:53: htsp_digit_ready(1/0): digit = 4

20:02:53: htsp_digit_ready(1/0): digit = 5

20:02:54: htsp_digit_ready(1/0): digit = 2

20:02:54: htsp_digit_ready(1/0): digit = 4

20:02:55: htsp_digit_ready(1/0): digit = 6

20:02:56: htsp_digit_ready(1/0): digit = 0

20:02:56: htsp_digit_ready(1/0): digit = 6

20:02:57: htsp_digit_ready(1/0): digit = 7

20:03:00: dsp_digit_collect_off: [1/0] packet_len=8 channel_id=128 packet_id=36

20:03:00: htsp_process_event: [1/0, FXSLS_OFFHOOK, E_HTSP_PROCEEDING]htsp_alert_notify

20:03:02: ipm_modem_relay_supported : false

20:03:02: ipm_modem_relay_supported : false

20:03:02: htsp_process_event: [1/0, FXSLS_OFFHOOK, E_HTSP_VOICE_CUT_THROUGH]htsp_connect: no_offhook

0 call_connected 0

20:03:09: htsp_process_event: [1/0, FXSLS_OFFHOOK, E_HTSP_CONNECT]fxsls_offhook_connect

20:03:09: [1/0] set signal state = 0x6 timestamp = 0

20:03:09: dsp_set_sig_state: [1/0] packet_len=12 channel_id=128 packet_id=39 state=0x6

timestamp=0x0htsp_call_feature:feature 24

htsp_call_feature: caller id enable 0x0 call_connected 1htsp_call_feature: feature 24, caller id not

enabled.

test-1#

test-1# #Fails below here#

test-1#

20:03:49: htsp_timer_stop3 htsp_release_req: cause 16, no_onhook 0

20:03:50: htsp_process_event: [1/0, FXSLS_CONNECT, E_HTSP_RELEASE_REQ]fxsls_connect_disc

20:03:50: htsp_timer_stop

20:03:50: [1/0] set signal state = 0xC timestamp = 0

20:03:50: dsp_set_sig_state: [1/0] packet_len=12 channel_id=128 packet_id=39 state=0xC timestamp=0x0

20:03:50: [1/0] set signal state = 0x4 timestamp = 750

20:03:50: dsp_set_sig_state: [1/0] packet_len=12 channel_id=128 packet_id=39 state=0x4

timestamp=0x2EE

20:03:50: htsp_timer - 950 msec

20:03:51: htsp_process_event: [1/0, FXSLS_CPC, E_HTSP_EVENT_TIMER]fxsls_cpc_timer

20:03:51: dsp_req_sig_state: [1/0] packet_len=8 channel_id=128 packet_id=40

20:03:51: htsp_dsp_message: SEND/RESP_SIG_STATUS: state=0xC timestamp=365 systime=7223104

20:03:51: htsp_timer - 60000 msec

20:03:51: htsp_process_event: [1/0, FXSLS_WAIT_ONHOOK, E_DSP_SIG_1100]fxsls_waitonhook_offhook

20:04:05: htsp_dsp_message: SEND/RESP_SIG_STATUS: state=0x4 timestamp=8567 systime=7224598

20:04:05: htsp_process_event: [1/0, FXSLS_WAIT_ONHOOK, E_DSP_SIG_0100]fxsls_waitonhook_onhook

20:04:05: htsp_timer_stop htsp_report_onhook_sig

20:04:05: TGRM: reg_invoke_tgrm_call_update(0, 1, 0, 0, 1, TGRM_CALL_IDLE, TGRM_CALL_VOICE,

TGRM_DIRECTION_IN)

20:04:05: ipm_dsprm_close_cleanup

test-1#

1 REPLY

Re: Fax fails over T1

What gateway protocol are you using (MGCP, H.323, SIP)? What codec are you using over the WAN (g.729, g.711, etc)? Fax transmissions do not work well with compression. Depending on your infrastructure and preferences, you have several options. Take a look at the following link. Specifically, see the sections on fax relay and fax pass-through. Another option is to set the region for your fax devices to a region that uses g.711 (no compression).

http://www.cisco.com/en/US/products/ps6441/products_configuration_guide_book09186a008053b4d3.html

Hope this helps. If so, please rate the post.

Brandon

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