Polycom SIP 2.2.0 ユーザーズマニュアル
Configuring Your System
4 - 45
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:
Configuration changes can performed centrally at the boot server or locally:
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
G722/16000
RFC 3047
16 Kbps,
24 Kbps,
32 Kbps
24 Kbps,
32 Kbps
16 Ksps
20ms - 80ms
7 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
RFC 2833
phone-event
RFC 2833
N/A
N/A
N/A
N/A
Central
(boot server)
Configuration file:
sip.cfg
sip.cfg
Specify codec priority, preferred payload sizes, and jitter buffer tuning
parameters.
parameters.
•
For more information, refer to
and
on page
.
Local
Web Server
(if enabled)
Specify codec priority, preferred payload sizes, and jitter buffer tuning
parameters.
parameters.
Navigate to http://<phoneIPAddress>/coreConf.htm#au
Changes are saved to local flash and backed up to <Ethernet
address>-phone.cfg on the boot server. Changes will permanently
override global settings unless deleted through the Reset Local
Config menu selection and the <Ethernet address>-phone.cfg is
removed from the boot server.
address>-phone.cfg on the boot server. Changes will permanently
override global settings unless deleted through the Reset Local
Config menu selection and the <Ethernet address>-phone.cfg is
removed from the boot server.