Welltech WG2504 FXS V.4.02 - Manual (Page 77)

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Figure 11.
Configure incoming Ring Cadence to FXO Gateway
When you connect WellGate 2540 FXO gateway Lines to local PABX’s extension
or PSTN switch, please go to WellGate 2540 webpage setting at VOIP
Advance  Ring to configure proper Ring Cadence ( Ring ON time and Ring
OFF time ) according to the PABX or PSTN ring Cadence specification .
Without configuring Ring Cadence to FXO gateway properly according to PABX
or PSTN Ring Cadence, FXO may detect Ring signal in a strange behavior and
cause abnormal operation.
WellGate 2540 factory default Ring Cadence setting is 1 seconds ON, 2
seconds OFF. Some PABX or PSTN provides 1 second ON and 3 seconds OFF
Ring Cadence. In this case, please configure WellGate 2540 Ring Cadence to 1
second ON and 3 seconds OFF to match incoming Ring signal. See Figure 12.
Figure 12.
Enable Caller ID function at FXO and FXS gateway.
The Caller ID configuration at FXO gateway should be configured to match