Specifications

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Cisco 1751 Router Software Configuration Guide
OL-1070-01
Syntax Description
Default
loop-start for FXO and FXS interfaces.
wink-start for E&M interfaces.
Command Mode
Voice-port configuration.
Usage Guidelines
Configuring the signal command for an FXS or FXO voice port changes the signal value for both voice
ports on a VIC.
Note If you change the signal type for an FXO voice port, you need to move the appropriate
jumper in the VIC.
Configuring this command for an E&M voice port changes only the signal value for the selected voice
port. In either case, the voice port must be shut down and then activated before the configured values
take effect.
Some PBXs miss initial digits if the E&M voice port is configured for immediate signaling. If this
occurs, use delay-dial signaling instead. Some devices (not Cisco devices) have a limited number of
DTMF receivers. This type of equipment must delay the calling side until a DTMF receiver is available.
loop-start Loop Start signaling. Used for FXO and FXS interfaces. With Loop
Start signaling, only one side of a connection can hang up. This is the
default setting for FXO and FXS voice ports.
ground-start Ground Start signaling. Used for FXO and FXS interfaces. Ground
Start allows both sides of a connection to place a call and to hang up.
wink-start Calling side seizes the line by going off-hook on its E lead and then
waits for a short off-hook “wink” indication on its M lead from the
called side before sending address information as DTMF digits. Used
for E&M tie trunk interfaces. This is the default setting for E&M voice
ports.
immediate Calling side seizes the line by going off-hook on its E lead and sends
address information as DTMF digits. Used for E&M tie trunk
interfaces.
delay-dial Calling side seizes the line by going off-hook on its E lead. After a
timing interval, the calling side looks at the supervision from the
called side. If the supervision is on-hook, the calling side starts
sending information as DTMF digits; otherwise, the calling side waits
until the called side goes on-hook and then starts sending address
information. Used for E&M tie trunk interfaces.