Yealink SIP-T4X Administration Manual page 209

Administrator's Guide for SIP-T4X IP Phones
these codecs are configurable on a per-line basis. The attribute "rtpmap" is used to
define a mapping from RTP payload codes to a codec, clock rate and other encoding
parameters.
The corresponding attributes of the codec are listed as follows:
Codec
PCMU
PCMA
G729
G722
G723_53
G723_63
G726-16
G726-24
G726-32
G726-40
GSM
iLBC
Packetization Time
Ptime (Packetization Time) is a measurement of the duration (in milliseconds) of the
audio data in each RTP packet sent to the destination, and defines how much network
bandwidth is used for the RTP stream transfer. Before establishing a conversation, codec
and ptime are negotiated through SIP signaling. The valid values of ptime range from
194
Configuration Methods
Configuration Files
Web User Interface
Configuration Files
Web User Interface
Configuration Files
Web User Interface
Configuration Files
Web User Interface
Configuration Files
Web User Interface
Configuration Files
Web User Interface
Configuration Files
Web User Interface
Configuration Files
Web User Interface
Configuration Files
Web User Interface
Configuration Files
Web User Interface
Configuration Files
Web User Interface
Configuration Files
Web User Interface
Priority RTPmap
1 0
2 8
3 18
4 9
0 4
0 4
0 103
0 104
0 102
0 105
0 97
0 106