Yealink T40G Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series IP Phones
380
Codec
Algorithm
Reference
Bit Rate
Sample
Rate
Packetization
Time
64-128 Kbps
48 Ksps
Note
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 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 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 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.
The IP phones support up to two calls or a three-way conference when using Opus.
The following table lists the audio codecs supported by each phone model:
Phone Model
Supported Audio Codecs
Default Audio Codecs
T48G/T46G/T42G/T41P/T2
9G
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
T54S/T52S/T48S/T46S/T42
S/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
T27P
G722, PCMA, PCMU, G729,
G726-16, G726-24, G726-32,
G726-40, iLBC_15_2kpbs,
iLBC_13_33kpbs
G722, PCMA, PCMU,
G729
T40P/T40G/T23P/T23G/T2
G722, PCMA, PCMU, G729,
G722, PCMA, PCMU,

Yealink T40G Specifications

General

SIP Accounts	3
Wall Mountable	Yes
Opus Codec	No
Display	2.3 inch 132x64-pixel graphical LCD
Network	Dual-port Gigabit Ethernet
PoE	Yes
Headset Support	Yes, RJ9 port
Power Adapter	Optional
Voice Codecs	G.722, G.711(A/μ), G.729AB, G.726
Local Phonebook	1000 entries