Yealink SIP-T33P Administrator's Guide

Administrator’s Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
115
Description
It configures whether to use audio encryption service.
Permitted
Values
0-Disabled
1-Optional, the phone will negotiate with the other phone what type of encryption to use for the ses-
sion.
2-Compulsory, the phone must use SRTP during a call.
Default
0
Web UI
Account > Advanced > RTP Encryption (SRTP)
Parameter
account.X.srtp_lifetime
[1]
<MAC>.cfg
Description
It configures the lifetime of the master key used for the cryptographic parameter in SDP. The value spe-
cified is the number of SRTP packets.
When the lifetime is set, a re-invite with a new key is sent when the number of SRTP packets sent for
an outgoing call exceeds half the value of the master key lifetime.
Note: Setting this parameter to a non-zero value may affect the performance of the phone. It works
only if “account.X.srtp_encryption” is set to 1 (Optional) or 2 (Compulsory).
Permitted
Values
Integer greater than or equal to 0
0-the master key lifetime is not set.
1 to 1024-the master key lifetime is 1024.
1025 to 2^48-the master key lifetime is the configured value.
A value greater than 2^48-the master key lifetime is 2^48.
Default
0
Parameter
account.X.srtp.unencrypted_rtp.enable
[1]
<MAC>.cfg
Description
It enables or disables the phone’s capability to include unencrypted RTP streams in SDP offers when
using SRTP.
Note: It works only if “account.X.srtp_encryption” is set to 1 (Optional) or 2 (Compulsory).
Permitted
Values
0-Disabled
1-Enabled, the phone offers both encrypted and unencrypted RTP streams (Unencrypted RTP
streams carry UNENCRYPTED_SRTP session parameters) in SDP offers. After a successful nego-
tiation, whether the RTP stream is encrypted or not depends on the SDP answer.
Default
0
Parameter
account.X.srtp.unencrypted_rtcp.enable
[1]
<MAC>.cfg
Description
It enables or disables the phone’s capability to include unencrypted RTCP streams in SDP offers
when using SRTP.
Note: It works only if “account.X.srtp_encryption” is set to 1 (Optional) or 2 (Compulsory).
Permitted
Values
0-Disabled
1-Enabled, the phone offers both encrypted and unencrypted RTCP streams (Unencrypted RTCP
streams carry UNENCRYPTED_SRTCP session parameters) in SDP offers. After a successful nego-
tiation, whether the RTCP stream is encrypted or not depends on the SDP answer.
Default
0

Yealink SIP-T33P Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Gray
Wall mountable	Yes
Operating system installed	Linux
Lines quantity	4 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	4
Volume control	Buttons
Number of function keys	5
Display diagonal	2.4 \
Display resolution	320 x 240 pixels
Voice codecs	AGC, AJB, CNG, G.711a, G.711u, G.722, G.723.1, G.726, G.729, G.729A, PLC, VAD, iLBC
Security algorithms	AES, HTTPS
Ethernet LAN data rates	10, 100 Mbit/s
Ethernet LAN interface type	Fast Ethernet
RJ-9 ports quantity	1
Ethernet LAN (RJ-45) ports	2
Input frequency	50/60 Hz
AC adapter input voltage	100 - 240 V
Power consumption (typical)	3 W
Power consumption (Power over Ethernet (PoE))	5 W
Number of handles included	1 pc(s)
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %

Weight and Dimensions

Depth	186 mm
Width	212 mm
Height	146 mm