[YMCS/YDMP Free Trial Program]Yealink would like to offer Free Trial Program of Yealink device management service for our current eligible customers. You can see the details below.

Post Reply 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
T21P_E2 firmware 84.0.125 slow with VLAN
Author Message
complex1 Offline
3CX Adv. Cert. Engineer

Posts: 1,392
Joined: Jan 2014
Reputation: 40
Post: #2
RE: T21P_E2 firmware 84.0.125 slow with VLAN
(10-28-2020 11:01 PM)GwenH Wrote:  At one customer we find the following network-latency problem...
Does anyone have a suggestion for a fix or cause?

Yealink T21P_E2 phones respond slow with firmware 84.0.125
ping-times are above 100ms (close to 200ms)
with version 81.0.110 performance is good, ping-times are below 20ms

All phones are directly connected to a switch and have VLAN configured through provisioning.
- the phones running firmware 81 have no network-latency.
- the phones running firmware 84 have a lot of network-latency.
downgrading the phone to firmware 81 solves the network-latency.
We can reproduce this with firmware upgrade/downgrade, without changing the physical network.

Currently we have downgraded all their (100+) T21P_E2 phones to v81,
but we would like to upgrade them to the latest firmware sometime soon.

At a different customer without VLAN we see no problems with firmware 84.


Please try next and test again...
After finishing the upgrade to the desired f/w version, reset the phone to factory settings and re-provisioning it.

Hope this will help.

Kind regards,

I am not an employee of Yealink.
Dutch is my native language, not English. Apologies for my imperfect grammar.
Please do not send unsolicited PM messages. I will not answer them.
10-28-2020 11:39 PM
Find all posts by this user    like0    dislike0 Quote this message in a reply
Post Reply 

Messages In This Thread
RE: T21P_E2 firmware 84.0.125 slow with VLAN - complex1 - 10-28-2020 11:39 PM

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Firmware upgrade fails on T21P E2 p.pasquino@technology4you.it 0 2,898 11-02-2021 04:42 PM
Last Post: p.pasquino@technology4you.it
  T26P Can not upgrade firmware martien.poels@bank2loyalty.com 2 7,807 09-21-2020 05:16 PM
Last Post: complex1
Lightbulb Yealink T28P Firmware Upgrade Fails Michelth 11 50,057 06-27-2020 10:13 AM
Last Post: complex1
  default username/password not working after firmware upgrade tfrohling 3 35,316 02-15-2020 01:30 PM
Last Post: khalidnisar
  T22 and firmware upgrade saleh 2 16,862 08-16-2019 01:15 PM
Last Post: justingoldberg
  Problem with low-level firmware of telephone T21 E2 protaganist 5 15,169 01-21-2019 11:50 AM
Last Post: protaganist
  T22P -0 3CX firmware web server fails preterion 1 7,160 04-17-2018 02:35 PM
Last Post: will3
  T21P E2 Downgrade Firmware & PJSIP OSPFs 3 13,208 03-06-2018 09:22 AM
Last Post: Jensen_Yealink
  [HELP] T21P VLAN 10 Issue jurgenskrause 4 12,554 08-10-2017 01:29 PM
Last Post: Ret
  T23G and T29G slow and unresponsive R Cable_Support 0 5,219 08-04-2017 08:58 AM
Last Post: R Cable_Support

Forum Jump:

User(s) browsing this thread: 1 Guest(s)

Contact Us   Yealink   Return to Top   Return to Content   Lite (Archive) Mode   RSS Syndication