Cisco WRP400-G1 - Wireless Router Administration Manual page 34

Configuring Voice Services
ATA Software Features
Cisco Small Business WRP400 Administration Guide
Feature
Secure Calls
Adjustable Audio
Frames Per Packet
DTMF
Call Progress Tone
Generation
Call Progress Tone
Pass Through
Echo Cancellation
Description
A user (if enabled by service provider or administrator)
has the option to make an outbound call secure in the
sense that the audio packets in both directions are
encrypted. See "Secure Call Implementation" section
on page 52.
This feature allows the user to set the number of audio
frames contained in one RTP packet. Packets can be
adjusted to contain from 1–10 audio frames. Increasing the
number of packets decreases the bandwidth utilized, but
it also increases delay and may affect voice quality. See
the RTP Packet Size parameter found in the SIP tab in the
"Advanced Voice Fields," on page
The WRP400 may 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. DTMF is configured in the
parameter found in the Line tabs. See the
Voice Fields," on page
The WRP400 has configurable call progress tones. Call
progress tones are generated locally on the WRP400 so
an end user is advised of status (such as ringback).
Parameters for each type of tone (for instance a dial tone
played back to an end user) may include frequency and
amplitude of each component, and cadence information.
See the Regional tab in the
page 57.
This feature allows the user to hear the call progress tones
(such as ringing) that are generated from the far-end
network. See the Regional tab in the
Fields," on page 57.
Impedance mismatch between the telephone and the IP
Telephony gateway phone port can lead to near-end echo.
The WRP400 has a near-end echo canceller that
compensates for impedance match. The WRP400 also
implements an echo suppressor with comfort noise
generator (CNG) so that any residual echo is not
noticeable. Echo Cancellation is configured in the
Regional, Line, and PSTN Line tabs. See
Fields," on page 57.
57.
DTMF Tx Mode
"Advanced
57.
"Advanced Voice Fields," on
"Advanced Voice
"Advanced Voice
3
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