ZyXEL Communications U-336SA - Manual (Page 74)

60 Special Functions
report RING to the software immediately. The software application can
then issue commands to answer the call and receive the fax. If the
remote caller is using a fax phone which does not send out a CNG tone
and is waiting for a fax answer tone in order to press the START
button, the caller can press a designated DTMF tone, which will
activate the modem to report and subsequently be ordered to answer
the fax call.
Setting Up EDR
The new EDR can be used at home where multiple phones are installed
in parallel. Once this function is enabled, the modem will go into EDR
mode after the ring disappears, and it will be able to detect the data/fax
CNG tone and DTMF tones, and report them as different types of
rings. The EDR settings are defined in S-register S51.
S51 Bit-mapped register: (default: 0)
Bits Bin. Dec. Description
(7,6) 00 0 Disable data CNG tone detection (default).
01 64 Report RING for data CNG tone.
10 128 Report RING 1 for data CNG tone.
11 192 Report RING 3 for data CNG tone.
(5,4) 00 0 Disable Fax-CNG tone detection (default).
01 16 Report RING for fax CNG tone.
10 32 Report RING 1 for fax CNG tone.
11 48 Report RING 2 for fax CNG tone.
(3,2) 00 0 Disable DTMF tone detection (default).
01 4 Report RING for a DTMF tone.
10 8 Report RING for a DTMF tone.
11 12 Reserved
(1,0) 00 0 Disable EDR (default).
01 1 Report RING twice.
10 2 Report RING four times.