Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series IP Phones
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Codec
Algorithm
Reference
Bit Rate
Sample
Rate
Packetization
Time
opus
opus
RFC 6716
16 Kbps
20 Kbps
8 Ksps
16 Ksps
20ms
Note
The Opus codec supports various audio bandwidths, defined as follows:
Abbreviation
Audio Bandwidth
Sample Rate (Effective)
NB (narrowband)
4 kHz
8 kHz
MB (medium-band)
6 kHz
12 kHz
WB (wideband)
8 kHz
16 kHz
SWB (super-wideband)
12 kHz
24 kHz
FB (fullband)
20 kHz
48 kHz
Note
The following table lists the audio codecs supported by each phone model:
Phone Model
Supported Audio Codecs
Default Audio Codecs
SIP-T48G/T46G/T42G/T41P
/T29G
G722, PCMA, PCMU, G729,
G726-16, G726-24, G726-32,
G726-40, G723_53, G723_63,
iLBC_15_2kpbs, iLBC_13_33kpbs
G722, PCMA, PCMU,
G729
SIP-T54S/T52S/T48S/T46S/
T42S/T41S/T27G
G722, PCMA, PCMU, G729,
G726-16, G726-24, G726-32,
G726-40, G723_53, G723_63, opus,
iLBC_15_2kpbs, iLBC_13_33kpbs
G722, PCMA, PCMU,
G729
SIP-T27P
G722, PCMA, PCMU, G729,
G726-16, G726-24, G726-32,
G726-40, iLBC_15_2kpbs,
iLBC_13_33kpbs
G722, PCMA, PCMU,
G729
SIP-T40P/T40G/T23P/T23G
G722, PCMA, PCMU, G729,
G722, PCMA, PCMU,
The network bandwidth necessary to send the encoded audio is typically 5~10% higher than the
bit rate due to packetization overhead. For example, a two-way G.722 audio call at 64 Kbps
consumes about 135 Kbps of network bandwidth.
The SIP-T40P/T40G/T23P/T23G/T21(P) E2/T19(P) E2 IP phones support using WB for opus
encoding; and using NB, MB, WB, SWB and FB for opus decoding.
The SIP-T54S/T52S/T48S/T46S/T42S/T41S/T27G IP phones support using WB (default) or NB for
opus encoding; and using NB, MB, WB, SWB and FB for opus decoding.
Summary of Contents for SIP-T19 E2 T4 Series
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Page 850: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series T5 Series IP Phones 828 ...
Page 887: ...Troubleshooting 865 The phone begins rebooting Any reboot of the phone may take a few minutes ...