Linksys ATA Administration Guide
24
ATA Software Features
Introducing Linksys Analog Telephone Adapters
International Caller ID
Delivery
In addition to support of the Bellcore (FSK) and Swedish/Danish (DTMF)
methods of Caller ID (CID) delivery, Linksys ATAs provide a large subset of
ETSI-compliant methods to support international CID equipment.
International CID is configured in the Line and PSTN Line tabs. See
”Linksys
ATA Voice Field Reference,” on page 94
.
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 57
.
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
”Linksys ATA Voice Field Reference,” on
page 94
.
DTMF
The Linksys ATA device 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
”Linksys ATA Voice Field Reference,” on
page 94
.
Call Progress Tone
Generation
The Linksys ATA device has configurable call progress tones. Call progress
tones are generated locally on the ATA device 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
”Linksys ATA Voice Field Reference,” on page 94
.
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
”Linksys ATA Voice Field Reference,” on page 94
.
Echo Cancellation
Impedance mismatch between the telephone and the IP Telephony gateway
phone port can lead to near-end echo. The Linksys ATA device has a near-
end echo canceller that compensates for impedance match. The Linksys ATA
device 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
”Linksys ATA Voice
Field Reference,” on page 94
.
Feature
Description
