Operation Manual

Getting Started
Ensuring Voice Quality
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 30
1
Ensuring Voice Quality
Voice quality perceived by the subscribers of the IP Telephony service should be
indistinguishable from that of a PSTN.
Supported Codecs
The table shows the codecs (voice compression algorithms) supported by
Cisco SPA IP phones. The Mean Opinion Score (MOS) measures the voice quality
by using a scale of 1–5, where 1 is the lowest quality and 5 is the highest quality.
723646 Enable or disables access to the administrative (admin) login on the
configuration utility. Press 1 to enable or 0 to disable, then press #.
To s a ve , p r e s s 1; to review, press 2; to re-enter, press 3; to exit, press *.
Number Option
Codec Complexity and Description MOS
G.711 (A-law
and u-law)
Very low complexity. Supports uncompressed
64 kbps digitized voice transmission at one to ten
5ms voice frames-per-packet. This codec
provides the highest voice quality and uses the
most bandwidth of any of the available codecs.
4.5
G.726 Low complexity. Supports compressed 16, 24,
32, or 64 kbps digitized voice transmission at
one to ten 10ms voice frames per packet. When
no static payload value is assigned per
RFC-1890, Cisco SPA IP phones can support
dynamic payloads for G.726.
G.726 is supported only for 32 kbps on the
Cisco SPA525G or Cisco SPA525G2.
4.1
(32 kbps)
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