Yealink T21PE2 - Quality of Service (Qos); Voice and SIP Qos Configuration

Phone Network
53
Default 0
Web UI Network->Advanced->VPN->Active
Phone UI
T54S/T52S/T48S/T48G/T46S/T46G/T29G:
Menu->Advanced (default password: admin) ->Network->VPN->VPN Active
T42G/T42S/T41P/T41S/T40P/T40G/T27G/T23P/T23G/T21(P) E2/T19(P) E2/CP920:
Menu->Settings->Advanced Settings (default password: admin) ->Network->VPN->VPN Active
Parameter static.openvpn.url <y0000000000xx>.cfg
Description
It configures the access URL of the *.tar file for OpenVPN.
Example:
static.openvpn.url = http://192.168.10.25/OpenVPN.tar
Permitted
Values
URL within 511 characters
Default Blank
Web UI Network->Advanced->VPN->Upload VPN Config
[1]
If you change this parameter, the IP phone will reboot to make the change take effect.
Quality of Service (QoS)
VoIP is extremely bandwidth and delay-sensitive. QoS is a major issue in VoIP implementations, regarding how to guar-
antee that packet traffic is not delayed or dropped due to interference from other lower priority traffic. VoIP can guar-
antee high-quality QoS only if the voice and the SIP packets are given priority over other kinds of network traffic. IP
phones support the DiffServ model of QoS.
Voice QoS
In order to make VoIP transmissions intelligible to receivers, voice packets should not be dropped, excessively delayed,
or made to suffer varying delay. DiffServ model can guarantee high-quality voice transmission when the voice packets
are configured to a higher DSCP value.
SIP QoS
SIP protocol is used for creating, modifying, and terminating two-party or multi-party sessions. To ensure good voice
quality, SIP packets emanated from IP phones should be configured with a high transmission priority.
DSCPs for voice and SIP packets can be specified respectively.
Note
For voice and SIP packets, the IP phone obtains DSCP info from the network policy if LLDP feature is enabled, which takes
precedence over manual settings. For more information on LLDP, refer to LLDP Configuration.
Topic
Voice and SIP QoS Configuration
Voice and SIP QoS Configuration
The following table lists the parameters you can use to configure voice QoS and SIP QoS.