Localizing Your Ip Phone - Cisco Small Business SPA509G Administration Manual

Localizing Your IP Phone

NOTE
Localizing Your IP Phone
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
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
•
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
•
Affects only OOB. Defaults to . 1 .
Inband DTMF Boost
•
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.
To get better detection by the IVR, avoid inband and use OOB. This way, the DTMF
tone is reconstructed by the PSTN gateway or the remote endpoint, and the
quality is not subject to distortion from the audio codec. If you use OOB, use a
slightly longer DTMF Playback Length.
If you use inband, use a higher Inband DTMF boost.
On the Cisco SPA525G2, when using the Mobile Link line (through the Bluetooth-
enabled mobile phone), the local user can hear a double tone (echo) when pressing
digits (DTMF tones) while engaged on a call. This can happen with certain mobile
phones that have the option to play locally the local tone (which is also played by
the Cisco SPA525G2). This does not affect operation with interactive voice
response applications, as the tone is audible only on the local device. See the Cisco
support community at
compatibility information, and also consult the latest Cisco SPA525G2 release
notes, available at cisco.com.
The following table describes the localization parameters in the
section.
: Local DTMF playback level in decibels per minute, up
: Local DTMF playback duration in milliseconds.
: Controls the amount of amplification applied to DTMF
http://www.cisco.com/go/smallbizsupport
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for phone
Miscellaneous
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