Configure Fax T38

Applies to version(s): 2.10, 3.0, 3.1, 3.2

To enable T.38:

1. Select Profiles from the navigation menu.

2. Click Create New Profile

3. Enter a name for the Fax Profile.

• Click Fax/Modem Relay to expand the view.

4. Configure the settings:

• Set Enable Fax/Modem Relay to enabled.
• Set Detection Mode to Standard.
• Set Relay Mode to T.38.
• Uncheck the Use V.34 option. (For reliability reason, some faxes failed to failback to V17

5. Verify that the Profile was successfully created message is displayed.

Path

/configurations/@[configuration_name]/profiles/@[profile_name]

Parameters (text)

/configurations/@[configuration_name]/profiles/@[profile_name]
name                            = "FaxPassThrough"

/configurations/@[configuration_name]/profiles/@[profile_name]/call_transfer_options
call_transfer_mode               = "Relay"
call_transfer_timeout            = "1 minute"
terminate_transferor_immediately = false

/configurations/@[configuration_name]/profiles/@[profile_name]/ivr_record
vad_enabled           = false
vad_noise_floor_level = "-30"

/configurations/@[configuration_name]/profiles/@[profile_name]/lnp_options
incoming_lnp_mode = "Terminate LNP"
outgoing_lnp_mode = "No LNP insertion"

/configurations/@[configuration_name]/profiles/@[profile_name]/mlpp_options
look_ahead_for_busy = "LFB allowed"
network_identity    = 0
outgoing_mode       = "No MLPP insertion"
precedence_level    = "PL flash override"
service_domain      = 0

/configurations/@[configuration_name]/profiles/@[profile_name]/tdm_line
subject_to_electric_hybrid_echo = true

/configurations/@[configuration_name]/profiles/@[profile_name]/tones_and_call_progress_options
busy_tone_max_duration                     = "30 seconds"
default_digit_duration                     = 100
default_interval_between_digits            = 60
generate_busy_tone                         = false
tone_definition_profile                    = "USA-Canada"

/configurations/@[configuration_name]/profiles/@[profile_name]/tones_and_call_progress_options/early_media_relay_and_ring_tone_generation
connect_full_duplex_during_early_media = false
delay_before_connecting_early_media    = "0 millisecond"
incoming_calls_early_media_mode        = "Forward from outgoing to incoming call"
outgoing_calls_early_media_mode        = "Automatic early media detection"
ring_tone_starting_state               = "Call Alerted"

Parameters (json)

{
  "call_transfer_options" : {
    "call_transfer_mode" : "Relay",
    "call_transfer_timeout" : "1 minute",
    "terminate_transferor_immediately" : false
  },
  "ivr_record" : {
    "vad_enabled" : false,
    "vad_noise_floor_level" : "-30"
  },
  "lnp_options" : {
    "incoming_lnp_mode" : "Terminate LNP",
    "outgoing_lnp_mode" : "No LNP insertion"
  },
  "mlpp_options" : {
    "look_ahead_for_busy" : "LFB allowed",
    "network_identity" : 0,
    "outgoing_mode" : "No MLPP insertion",
    "precedence_level" : "PL flash override",
    "service_domain" : 0
  },
  "name" : "@[profile_name]",
  "tdm_line" : {
    "subject_to_electric_hybrid_echo" : true
  },
  "tones_and_call_progress_options" : {
    "busy_tone_max_duration" : "30 seconds",
    "default_digit_duration" : 100,
    "default_interval_between_digits" : 60,
    "early_media_relay_and_ring_tone_generation" : {
      "connect_full_duplex_during_early_media" : false,
      "delay_before_connecting_early_media" : "0 millisecond",
      "incoming_calls_early_media_mode" : "Forward from outgoing to incoming call",
      "outgoing_calls_early_media_mode" : "Automatic early media detection",
      "ring_tone_starting_state" : "Call Alerted"
    },
    "generate_busy_tone" : false,
    "tone_definition_profile" : "USA-Canada"
  },
  "custom_cause_maps" : {
  },
  "tdm" : {
    "ss7" : {
      "default_backward_call_indicator" : "0x5404",
      "default_backward_call_indicator_enforce_mask" : "0x0000",
      "default_forward_call_indicator" : "0x2001",
      "default_forward_call_indicator_enforce_mask" : "0x0000",
      "dont_forward_early_acm" : false,
      "force_backward_call_indicator_in_anm" : false,
      "forward_application_transport_ie" : false,
      "forward_call_cpg_hold_retrieval" : true,
      "forward_call_indicator_international" : false,
      "forward_call_suspend_resume" : true,
      "hop_counter_ie_handling" : "Decrement and forward",
      "send_charge_number_ie_in_iam" : false
    },
    "ss7_or_isdn" : {
      "always_send_alerting" : false,
      "cnam_collection_timeout" : "1 second",
      "cnam_using_alternate_methods" : false,
      "colr" : false,
      "information_transfer_capability" : "Relay",
      "network_specific_facilities_ie" : "",
      "send_connected_number_ie" : false,
      "send_display_ie" : false,
      "support_2_calling_number_ie" : false
    }
  },
  "voip" : {
    "fax_modem_relay" : {
      "detection_mode" : "Standard",
      "enable_early_fax_modem_tone_detection" : false,
      "enable_fax_modem_relay" : true,
      "expected_cng_tones" : 2,
      "fax_modem_passthrough_parameters" : {
        "codec" : "PCMU",
        "detection_type" : "Silence suppression off",
        "force_v152_vbd" : false,
        "jitter_buffer_depth" : 40,
        "packet_duration" : "20ms",
        "support_v152_vbd" : false,
        "use_nse" : false
      },
      "fax_modem_tones_detection_duration" : "30 seconds",
      "modem_vs_fax_distinction_timeout" : "0 millisecond",
      "relay_mode" : "Passthrough",
      "switch_to_fax_relay_upon_cng_tone" : true,
      "switch_to_passthrough_upon_bell_ans" : true,
      "t38_parameters" : {
        "fill_bit_removal" : false,
        "max_bitrate" : "14400",
        "redundancy_count" : 0,
        "transmission_level_minus_dbm" : 10,
        "use_v34" : false
      }
    },
    "rtp_and_audio" : {
      "clear_channel_packet_duration" : "20ms",
      "codec_g726_aal2_format" : false,
      "drop_call_thresholds_no_rx_packets" : "0 second",
      "echo_cancellation" : {
        "echo_cancellation_enabled" : true,
        "enable_coefficient_update" : true,
        "enable_dc_removal_filter" : true,
        "gain_power_level" : "0",
        "non_linear_processor_tune_option" : "Normal"
      },
      "jitter_buffer" : {
        "initial_depth" : 20,
        "max_depth" : 200,
        "min_depth" : 20,
        "smooth_deletion" : true
      },
      "packet_network" : {
        "packet_loss_concealment" : true,
        "type_of_service" : 0
      },
      "rtcp" : {
        "rtcp_enabled" : false,
        "sdes_cname" : "",
        "transmission_interval" : "5 seconds",
        "use_xrtcp" : false
      },
      "tdm_volume_control" : {
        "rx_gain_level" : 0,
        "tx_gain_level" : 0
      },
      "vad_noise_floor_level" : "-45"
    },
    "sdp" : {
      "force_fax_tones_as_telephony_event" : false,
      "profile_sdp_description" : "m=audio 0 RTP/AVP 0 8 4 18 101 13\r\na=rtpmap:101 telephone-event/8000\r\na=fmtp:101 0-15,32-36"
    },
    "sip" : {
      "detect_180_with_sdp_as_early_media" : true,
      "dont_forward_183_progress" : false,
      "dtmf_relay_scheme" : [
        "Relay DTMF according to RFC2833",
        "Relay DTMF using SIP INFO messages",
        "Relay DTMF in band"
      ],
      "enable_sip_custom_headers" : false,
      "forward_sip_hold_type" : "SS7 Remote Hold/Retrieval",
      "forward_ss7_cpg_hold_retrieval" : true,
      "forward_ss7_suspend_resume" : true,
      "max_forwards_handling" : "Decrement and forward",
      "sdp_combining_options" : [
        "Use sender's codec order"
      ],
      "sdp_generation_options" : [
      ],
      "send_180_with_sdp" : false,
      "use_isup_oli_format" : false,
      "use_non_ambiguous_from_tag" : false,
      "use_reason_header" : true,
      "use_strict_routing" : false,
      "user_to_user_encoding" : "Escaped text"
    }
  }
}