Best Way to Send Fax on Sangoma ?

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Hi

What should be the optimal settings for HWEC related parameters in
wanpipe1.conf to be able to receive Fax over T.30 on a Sangoma A108DE Card ?

In particular, should I enable echo ? If yes, to what parameter ? What
other values like RXGAIN, TXGAIN should I tune ?

TDMV_HW_DTMF
= YES # YES: receive dtmf events from hardware
TDMV_HW_FAX_DETECT = YES # 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