Cisco Systems WRP400 Manual De Usuario

PSTN Line page (SPA3102)

ATA Administration Guide

207

Voice tab > PSTN Line page > 

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.