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T21P_E2 firmware 84.0.125 slow with VLAN
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GwenH Offline
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Post: #1
T21P_E2 firmware 84.0.125 slow with VLAN
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.
(This post was last modified: 10-28-2020 11:07 PM by GwenH.)
10-28-2020 11:01 PM
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complex1 Offline
3CX Adv. Cert. Engineer
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Posts: 1,026
Joined: Jan 2014
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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.

Hi,

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,
Frank.

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
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GwenH Offline
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Posts: 3
Joined: Oct 2020
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Post: #3
RE: T21P_E2 firmware 84.0.125 slow with VLAN
Unfortunately performing Phone factory reset and then re-provisioning did not solve the issue

(10-28-2020 11:39 PM)complex1 Wrote:  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.
11-03-2020 05:42 PM
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complex1 Offline
3CX Adv. Cert. Engineer
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Posts: 1,026
Joined: Jan 2014
Reputation: 28
Post: #4
RE: T21P_E2 firmware 84.0.125 slow with VLAN
(11-03-2020 05:42 PM)GwenH Wrote:  Unfortunately performing Phone factory reset and then re-provisioning did not solve the issue

(10-28-2020 11:39 PM)complex1 Wrote:  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.

Hi,

I guess the best way to solve this issue is to submit a support ticket @ Yealink.
https://ticket.yealink.com/

Kind regards,
Frank.

Dutch is my native language, not English. Apologies for my imperfect grammar.
Please do not send unsolicited PM messages. I will not answer them.
11-03-2020 11:01 PM
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