Voice Parameters
Provisioning Guide for Cisco SPA100 and SPA200 Series Analog Telephone Adapters 139
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<Referral_Services_Code>s These codes tell the ATA what to do when the user places the
current call on hold and is listening to the second dial tone.
One or more *codes can be configured into this parameter,
such as *98, or *97|*98|*123, etc. The maximum length is 79
characters. This parameter applies when the user places the
current call on hold by pressing the hook flash button. Each
*code (and the following valid target number according to
current dial plan) triggers the ATA to perform a blind transfer
to a target number that is prepended by the service *code.
For example, after the user dials *98, the ATA plays a special
dial tone called the Prompt Tone while waiting for the user the
enter a target number (which is checked according to dial
plan as in normal dialing). When a complete number is
entered, the ATA sends a blind REFER to the holding party
with the Refer-To target equal to *98 target_number. This
feature allows the ATA to hand off a call to an application
server to perform further processing, such as call park.
The *codes should not conflict with any of the other vertical
service codes internally processed by the ATA. You can
empty the corresponding *code that you do not want the ATA
to process.
Default setting: blank
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