Call Termination before Call Establishment

The device supports the following call termination methods before a call is established:

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Call termination upon receipt of SIP error response (in Automatic Dialing mode): By default, when the FXO device operates in Automatic Dialing mode, there is no method to inform the PBX if a Tel-to-IP call has failed (SIP error response - 4xx, 5xx or 6xx - is received). The reason is that the FXO device doesn't seize the line until a SIP 200 OK response is received. Use the FXOAutoDialPlayBusyTone parameter to allow the device to play a busy / reorder tone to the PSTN line if a SIP error response is received. The FXO device seizes the line (off-hook) for the duration defined by the TimeForReorderTone parameter. After playing the tone, the line is released (on-hook).

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Call termination after caller (PBX) on-hooks phone (Ring Detection Timeout feature): This method operates in one of the following manners:

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Automatic Dialing is enabled: if the remote IP party doesn't answer the call and the ringing signal (from the PBX) stops for a user-defined time (configured by the parameter FXOBetweenRingTime), the FXO device releases the IP call.

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No automatic dialing and Caller ID is enabled: the device seizes the line after detection of the second ring signal (allowing detection of caller ID sent between the first and the second rings). If the second ring signal is not received within this timeout, the device doesn't initiate a call to IP.