Configuring Regional Parameters and Supplementary Services
Miscellaneous Parameters
Cisco Small Business SPA 300 Series, SPA 500 Series, and WIP310 IP Phone Administration Guide 167
7
Miscellaneous Parameters
This section contains both DTMF parameters and localization parameters:
• DTMF Parameters, page 167
• Localizing Your IP Phone, page 168
• Managing the Time and Date, page 169
• Configuring Daylight Savings Time, page 170
• Daylight Saving Time Examples, page 171
• Selecting a Display Language, page 171
• Creating a Dictionary Server Script, page172
DTMF Parameters
Dual Tone Multi-Frequency (DTMF) is the system used by touch-tone phones.
DTMF assigns a specific frequency (consisting of two separate tones) to each key
so that it can easily be identified by a microprocessor.
In-Band and Out-of-Band (RFC 2833): IP phones can relay DTMF digits as out-of-
band events to preserve the fidelity of the digits. This can enhance the reliability of
DTMF transmission required by many IVR applications such as dial-up banking
and airline information.
The following parameters can either help false detection or get better detection
by the IVR. In general, the default values are recommended for both IVR functions.
•
DTMF Playback Level
: Local DTMF playback level in decibels per minute, up
to one decimal place. Applicable locally when a user presses a digit or
when the phone receives an out-of-band (OOB) DTMF signal from the
network side. Does not affect DTMF transmission. Defaults to -16.
•
DTMF Playback Length
: Local DTMF playback duration in milliseconds.
Affects only OOB. Defaults to .1.
•
Inband DTMF Boost
: Controls the amount of amplification applied to DTMF
signals. Affects only tones sent by inband method. Choices are 0, 3, 6, 9, 12,
15, and 18 decibels. Defaults to 12 dB.
To help false detection, avoid inband and use OOB. With OOB, the DTMF Playback
Length does not matter. If you use inband, use a smaller DTMF Boost value.
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