Audio Codecs - Polycom SIP 2.2.2 Manual

Note

Audio Codecs

Algorithm MIME Type
G.711μ-law PMCU
G.711a-law PCMA
G.722 G722/8000
G.722.1 G722/16000
G.729AB G729
SID CN
RFC 2833 phone-event
Central Configuration file:
sip.cfg
(boot server)
Local Web Server
(if enabled)
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.
AEC on the SoundPoint IP 301 handset is not supported.
The following table summarizes the phone's audio codec support:
Ref. Bit Rate
RFC 1890 64 Kbps
RFC 1890 64 Kbps
RFC 1890 64 Kbps
RFC 3047 16 Kbps,
24 Kbps,
32 Kbps
RFC 1890 8 Kbps
RFC 3389 N/A
RFC 2833 N/A
Configuration changes can performed centrally at the boot server or locally:
Specify codec priority, preferred payload sizes, and jitter buffer tuning
parameters.
• For more information, refer to
on page
Specify codec priority, preferred payload sizes, and jitter buffer tuning
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.
Sample
Rate Frame Size
8 Ksps 10ms - 80ms
8 Ksps 10ms - 80ms
16 Ksps 10ms - 80ms
16 Ksps 20ms - 80ms
8 Ksps 10ms - 80ms
N/A N/A
N/A N/A
Codec Preferences <codecPref/>
A-35 and Codec Profiles <audioProfile/>
Configuring Your System
Effective
audio
bandwidth
3.5KHz
3.5KHz
7 KHz
7 KHz
3.5KHz
N/A
N/A
on page A-36.
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