Polycom 1725-11530-310 ユーザーズマニュアル
Administrator’s Guide SoundPoint IP / SoundStation IP
4 - 76
When using the handset on any SoundPoint IP phones, AEC is not normally
required. In certain situations, where echo is experienced by the far-end party,
when the user is on the handset, AEC may be enabled to reduce/avoid this
echo. To achieve this, make the following changes in the sip.cfg configuration
file (default settings for these parameters are disabled):
voice.aec.hs.enable = 1
voice.aes.hs.enable = 1
voice.ns.hs.enable = 1
voice.ns.hs.signalAttn = -6
voice.ns.hs.silenceAttn = -9
For more information, refer to
on page
, and
on page
.
For the SoundPoint IP 501 and 601, utilizing acoustic echo cancellation will
introduce a small delay increase into the audio path which might cause a lower
voice quality.
Audio Codecs
The following table summarizes the phone’s audio codec support:
Note
AEC on the SoundPoint IP 301 handset is not supported.
Algorithm
MIME Type
Ref.
Bit Rate
Sample
Rate
Rate
Frame Size
Effective
audio
bandwidth
audio
bandwidth
G.711
μ-law
PMCU
RFC 1890
64 Kbps
8 Ksps
10ms - 80ms
3.5KHz
G.711a-law
PCMA
RFC 1890
64 Kbps
8 Ksps
10ms - 80ms
3.5KHz
G.722
G722/8000
RFC 1890
64 Kbps
16 Ksps
10ms - 80ms
7 KHz
G.722.1
G7221/16000
RFC 3047
16 Kbps,
24 Kbps,
32 Kbps
24 Kbps,
32 Kbps
16 Ksps
20ms - 80ms
7 KHz
G.722.1C
G7221/
32000
32000
G7221C
24 Kbps
32 Kbps
48 Kbps
32 Kbps
48 Kbps
32 Ksps
20ms - 80ms
14 KHz
G.729AB
G729
RFC 1890
8 Kbps
8 Ksps
10ms - 80ms
3.5KHz
SID
CN
RFC 3389
N/A
N/A
N/A
N/A
Lin16
L16/16000
L16/32000
L16/48000
L16/32000
L16/48000
RFC 1890
25.6 Kbps
51.2 Kbps
76.8 Kbps
51.2 Kbps
76.8 Kbps
16 Ksps
32 Ksps
48 Ksps
32 Ksps
48 Ksps
10ms
7 KHz
14 KHz
22 KHz
14 KHz
22 KHz