Spa901 Features; Spa92X, Spa94X, Spa962; Ensuring Voice Quality - Linksys SPA 900 Series Administration Manual

Linksys IP Phone Features

SPA901 Features

The SPA901 provides the following features that are not needed with the Linksys IP phones that provide
an LCD display:
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SPA92x, SPA94x, SPA962

The SPA921, SPA922, SPA941, SPA942, and SPA962 provide an LCD display and additional features
that are not provided with the SPA901, including the following:
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Ensuring Voice Quality

Voice quality perceived by the subscribers of the IP Telephony service should be indistinguishable from
that of the PSTN. Voice quality can be measured with such methods as Perceptual Speech Quality
Measurement (PSQM), with a scale of 1–5, in which lower is better; and Mean Opinion Score (MOS),
with a scale of 1–5, in which higher is better.
Table 1-2
information about bandwidth requirements for each supported codec, refer to
Table 1-2
Algorithm
G.711
G.726
G.729a
Linksys IP Phone Administrator Guide
1-4
Built-in Interactive Voice Response (IVR) system to check status and change configuration
Ringer and Handset Volume Controls
Handset Input Gain Adjustment
Line Status Indicators: Active Line, Name, and Number
Menu-Driven User Interface
Digits Dialed with Number Auto-Completion
Caller ID Name and Number and Outbound Caller ID Blocking
On-Hook Dialing
Redial from Call Logs
Personal Directory with Auto-dial (100 entries)
On Hook Default Audio Configuration (Speakerphone and Headset)
Called Number with Directory Name Matching
Call Number using Name - Directory Matching or via Caller ID
Subsequent Incoming Calls with Calling Name and Number
Name and Identity (Text) Displayed at Start Up
Distinctive Ringing Based on Calling and Called Number
displays speech quality metrics associated with various audio compression algorithms. For
Speech Quality Metrics
Complexity
Very low
Low
Low–medium
MOS Score
4.5
4.1 (32 kbps)
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Chapter 1 Introducing Linksys IP Phones
Table 2-1 on page
Firmware Version 5.1
2-10.