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The EDR settings are defined in S-register S51.
S51 Bit-mapped register, default: 0:
EDR detection (either CNG or DTMF tones) will be disabled once it occurs. However,
a customer's program might not answer because the setting of the software may require
multiple rings in order to answer. S51 bits 0-1 control the number of rings that the mo-
dem will report once the CNG or DTMF tone is detected.
The timing relationship between the caller ID (if enabled), EDR, and ring detec-
tion is as follows:
1st 2nd 3rd
on off on off on
***-------***-------***---------------------------------
3s 3s 3s 3s S7 timeout
+-----+---+-----+---+-----+---+-----------------+----
CID/EDR RD EDR RD EDR RD EDR RD
CID: Caller ID task
RD: Ring Detection task
EDR: EDR task
Code Bits Bin. Dec. Description
(7,6) 00 0 Disables data CNG tone detection.
01 64 Reports RING for data CNG tone.
10 128 Reports RING 1 for data CNG tone.
11 192 Reports RING 3 for data CNG tone.
(5,4) 00 0 Disables Fax-CNG tone detection. (Default)
01 16 Reports RING for fax CNG tone.
10 32 Reports RING 1 for fax CNG tone.
110 48 Reports RING 2 for fax CNG tone..
(3,2) 00 0 Disables DTMF tone detection.
01 4 Reports RING for a DTMF tone.
10 8 Reports RING <DTMF> for a DTMF tone.
11 12 Reserved.
(1,0) 00 0 Disables EDR.
01 1 Reports RING twice.
10 2 Reports RING four times.
11 3 Reports RING six times.
Note: During the EDR period, any AT command will immediately disable
the EDR function.