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SPA900 Series Features
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SPA92x, SPA94x, and SPA962 Features
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
algorithms.
Table 1-2
Algorithm
G.711
G.726
G.729a
G.729
G.723.1
Linksys 900 Series IP Phone Administrator Guide
1-4
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
Speech Quality Metrics
Bandwidth
64 kbps
16, 24, 32, 40 kbps
8 kbps
8 kbps
6.3, 5.3 kbps
Chapter 1
Introducing Linksys 900 Series IP Phones
Complexity
MOS Score
Very low
4.5
Low
4.1 (32 kbps)
Low–medium
4
Medium
4
High
3.8
Document Version 3.0
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