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PIN-digit timeout is hard wired at 10 seconds. Up to 8 PSTN PIN numbers can be configured in the
SPA. If the given PIN does not match any of the PSTN PIN values, the SPA plays reorder tone to the
FXO port for up to 10 seconds and then takes the FXO port on-hook. If the given PIN matches one of
PSTN PIN values, the SPA plays dial tone to the FXO port and is ready to accept digits of the target
VoIP number from the PSTN caller. The collected digits will be processed by the dial plan associated
with the PIN number.
Note: If Authentication is disabled, a default dial plan is used for all PSTN Callers.
4.5.1. Terminating
Gateway
Calls
There are two (2) call legs in a gateway call: the PSTN call leg and the VoIP call leg. A gateway call is
terminated when either call leg is ended. It is very important that the SPA takes the FXO port on-hook
when the call terminates or else the PSTN line cannot be used again. The SPA detects that the
PSTN call leg is ended when one of the following conditions occur during a call:
1. The FXO line voltage drops to a very low value (as if the line is disconnected from the PSTN
service or the PSTN switch provides a CPC signal).
2. A polarity reversal is detected at the FXO port.
3. Disconnect Tone detected on the FXO port.
4. When there is no voice activity for a long (configurable) period of time in either direction at the FXO
port.
When any of the above occurs, the SPA takes the FXO port on hook and sends a BYE request to end
the VoIP call leg. On the other hand, when the SPA receives a SIP BYE from the VoIP during a call, it
takes the FXO port on hook to end the PSTN call leg.
In addition, the SPA can also send a refresh signal periodically to the VoIP call leg to determine if the
call leg is still up. If a refresh operation fails, the SPA ends both call legs.
Parameter
Group Description
Range
Detect CPC:
FXO
If yes, SPA will detect CPC as a disconnect signal.
Default = Yes
Bool
Detect Long Silence:
FXO
If yes, SPA will detect prolonged silence period as
a disconnect signal. Default = Yes
Bool
Long Silence Duration:
FXO
The minimum duration of continuous silence before
the SPA will disconnect the call, if <Detect Long
Silence> is enabled. Default = 30 (s)
10-255
Disconnect Tone:
FXO
Tone Script of the disconnect tone to detect.
Default = “480@-30,620@-30;4(.25/.25/1+2)”.
Note:
Currently SPA supports two frequency
components. If the tone has only 1 frequency, use
the same value for both frequencies
Each cadence segment must have the same
frequency
The level value is the threshold to detect each
tone.
The total duration is the minimum duration of the
tone to be recognized as the disconnect tone
ToneScript
Detect Polarity
Reversal:
FXO
If yes, SPA will detect polarity reversal as a
disconnect signal. Note: If it is an inbound PSTN
Bool
