ATA Voice Field Reference
Line page
Cisco Small Business ATA Administration Guide 180
B
PSTN Disconnect Detection section (SPA8800)
On the SPA8800, these settings are configured on the Phone pages only.
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 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 .
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.
Detect PSTN Long
Silence
If enabled, SPA will disconnect both call legs when the
PSTN side has no voice activity for a duration longer than
the length specified in the PSTN Long Silence Duration
parameter during a gateway call.
The default is yes.
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