Welltech WG2504 FXS V.4.02 - Manual (Page 80)

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Step 3: Enable Caller ID generation at WellGate 2504 FXS gateway. See
Figure 16.
Go to FXS Setting  FXS Line  Caller ID Mode to select Transparent to
enable Caller ID generation. After enable this command, analog telephone set
is able to display Caller ID either
FXS phone number (at this example, they are
501 to 504) or display number which were sent from FXO gateway ( PSTN, SIP
Trunk or FXO Line number ).
Step 4: Select FXS gateway’s Caller ID Mode. See Figure 17 and 18.
FXS Gateway Caller ID generation is able to configure which Caller ID mode in
order to match analog phone set’s Caller ID specification. Go to FXS Setting

Caller ID  Caller ID Mode to select one of Caller ID Mode ( DTMF, FSK
Bellcore, FSK ETSI, See Figure 18 ). There are other options you may need to
pay attention at Polarity Reverse Before Caller ID, Dual Tone Before Caller ID,
Caller ID Present, DTMF Caller ID start and stop digit. See Figure 18.
Figure 16. Caller ID feature enable.