Configuring Regional Parameters and Supplementary Services
Miscellaneous Parameters
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 206
7
Outbound Call Codec Selection Codes
Codec call selection codes affect voice quality. For more information about voice
codecs, see the Configuring Voice Codecs. You can choose a
preferred
codec
for a call or
force
a call to use a specific codec:
• Prefer
G.711u (*017110)
through
G.729a (*01729)
—Sets the preferred
codec for next outbound call. If the preferred codec is unavailable, the
second, then the third preferred codec is used, if specified.
• Force
G.711u (*027110)
through
G.729a (*02729)
—Forces the specified
codec for next outbound call. If the specified codec is unavailable, the
preferred codecs are used in order, if specified.
See Configuring Voice Codecs for more information.
Miscellaneous Parameters
This section describes Dual Tone Multi-Frequency (DTMF) and localization
parameters:
DTMF Parameters
DTMF is used by touch-tone phones to assign 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 reduce 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.
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