Yealink T5 Series, Administrator'S Manual, Page: 51 / 472

Phone Network
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Phone UI 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 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. The
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.
Video QoS
To ensure acceptable visual quality for video, video packets emanated from the phones should be configured with a
high transmission priority. It is not applicable to CP960 phones.
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 the phones should be configured with a high transmission priority.
DSCPs for voice and SIP packets can be specified respectively.
Wi-Fi QoS
Wi-Fi Multimedia (WMM) is based on the IEEE 802.11e standard and provides basic Quality of service (QoS) features to
wireless networks. QoS enables Wi-Fi access points to prioritize traffic and optimizes the way shared network resources
are allocated among different applications.
Note
For voice and SIP packets, the phone obtains DSCP info from the network policy if LLDP feature is enabled, which takes pre-
cedence over manual settings. For more information on LLDP, refer to
LLDP Configuration
.
Topic
Voice, Video and SIP QoS Configuration