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ATA Voice Field Reference
PSTN Line page (SPA3102)
ATA Administration Guide 207
B
Voice tab > PSTN Line page >
PSTN Disconnect Detection section
PSTN Hook Flash
Len
The length of the hook flash in seconds. During a PSTN-to-
VoIP gateway call, the ATA device processes the out-of-
band hook flash signal sent from the VoIP peer through a
hook-flash (momentary on-hook signal) on the FXO port.
This allows the VoIP peer to initiate a three-way
conference call and subsequent call transfer. The duration
of the on-hook signal can be configured using this
parameter.
The default is 0.25. The permitted range is limited to 0.02
to 1.6 seconds.
PSTN Ring Thru
CWT Delay
Specify the delay before incoming PSTN calls will ring Line
1 using a Call Waiting
Tone. The default is 3.
PSTN Ring Timeout Specify the delay after a ring burst before the Gateway
decides that the PSTN ring has ended. The default is 5.
PSTN Dialing Delay Specify the delay after the PSTN phone line is on-hook
before the Gateway dials a PSTN number. The default is 1.
PSTN Dial Digit Len Specify the on/off time when the Gateway transmits digits
through the Line (FXO) port. The syntax is on-time/off-time,
expressed in seconds with up to two decimal places. The
permitted range is 0.05 to 3.00. The default is .1/.1.
PSTN Hook Flash
Len
Default is .25.
Detect CPC CPC is a brief removal of tip-and-ring voltage. If enabled,
the SPA will disconnect both call legs when this signal is
detected during a gateway call.
The default is yes.
Detect Polarity
Reversal
If enabled, SPA will disconnect both call legs when this
signal is detected during a gateway call. If it is a PSTN
gateway call, the 1st polarity reversal is ignored and the
2
nd
one triggers the disconnection. For VoIP gateway call,
the 1
st
polarity reversal triggers the disconnection.
The default is yes.