6
Voice Software Enhancements for the Cisco 1750 and Cisco 1751 Routers
OL-1671-01
Supported Features
Configuring the Alerting Method for Caller ID
Configuration of the alerting method is required when the Caller ID standard, specified by locale through
the cptone command, is other than Bellcore/Telcordia (if you do not configure the alerting method, the
default Caller ID alerting ring 1 command is applied). The command that you enter is determined by
the Bellcore/Telcordia or ETSI standard that your service provider uses for Caller ID.
Follow these steps to configure the alerting method:
.
Configuration Example
The following example shows Caller ID configuration on the FXO, FXS, and DID voice ports:
router-config#voice-port 1/0
station-id name cisco
station-id number 123
Caller ID enable
Command Purpose
Step 1
Router(config)# router(config-voiceport)#
Caller ID alerting ring {1 | 2}
Configure this command on FXO ports where Caller ID
information is received from a subscriber telephone line and on
FXS voice ports from which Caller ID information is transmitted
to an attached telephone device.
Compatible settings are required on both ends of the telephone line
connection for Caller ID information to be displayed.
Enter 1 if your telephone line service provider or telephone device
specifies it, to provide or expect Caller ID information following
the first ring at the receiving station. This is the default setting.
Enter 2 to provide or expect Caller ID information during the long
ring pause following two short rings. This setting is used in
Australia and the United Kingdom.
Step 2
Router(config-voiceport)# Caller ID
alerting line-reversal
(FXS ports only.) Configure this setting only when the attached
telephone device requires line polarity reversal to signal the start
of Caller ID information transmission.
Step 3
Router(config-voiceport)# Caller ID
alerting dsp-pre-alloc
(FXO ports, only when Caller ID alerting line-reversal is
required.) Configure this command on the FXO port when the
incoming subscriber telephone line uses line polarity reversal to
signal the start of Caller ID information transmission.
The Cisco FXO interface cannot detect line-reversal alerting in the
on-hook state. For this reason, digital signal processors (DSPs)
must be pre-allocated to serve the Type 1 Caller ID information
when it arrives. Pre-allocating the DSPs enables the DSPs to
continuously monitor for the arrival of Caller ID information.
Step 4
Router(config-voiceport)# Caller ID
alerting pre-ring
(FXS ports only.) Configure this setting only when the attached
telephone device requires the pre-ring (immediate ring) method to
signal the start of a Caller ID information. The command activates
a 250-millisecond (ms) pre-ring.
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