Cisco WRP400-G1 Administration Guide - Page 34

Advanced Voice Fields, on Secure Call Implementation

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Page 34 highlights

Configuring Voice Services ATA Software Features 3 Feature Description Secure Calls 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. Adjustable Audio Frames Per Packet 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 57. DTMF 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 DTMF Tx Mode parameter found in the Line tabs. See the "Advanced Voice Fields," on page 57. Call Progress Tone Generation 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 "Advanced Voice Fields," on page 57. Call Progress Tone Pass Through 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 "Advanced Voice Fields," on page 57. Echo Cancellation 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 "Advanced Voice Fields," on page 57. Cisco Small Business WRP400 Administration Guide 32

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Configuring Voice Services
ATA Software Features
Cisco Small Business WRP400 Administration Guide
32
3
Secure Calls
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
.
Adjustable Audio
Frames Per Packet
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 57
.
DTMF
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
DTMF Tx Mode
parameter found in the Line tabs. See the
“Advanced
Voice Fields,” on page 57
.
Call Progress Tone
Generation
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
“Advanced Voice Fields,” on
page 57
.
Call Progress Tone
Pass Through
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
“Advanced Voice
Fields,” on page 57
.
Echo Cancellation
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
“Advanced Voice
Fields,” on page 57
.
Feature
Description