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T28 packet loss / delay error - Printable Version

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T28 packet loss / delay error - crafty - 12-17-2014 10:49 PM

Every morning on 14 pcs of T28 phones I have delay.
After 1 year since I started to use T28 phones suddenly last week all 14 pcs from one of my network has developed an strange problem.

The problem:I initiate a call from phone no.1 to phone no.2 and only after 7 seconds I can talk.
During this problem I have a lot of packet loss. The computer connected in phone is working fine (no packet loss).
In the same network, in the same switch I have also T19 phones working very good.
After a daily restart (unplug power cord), in the morning, everything working fine for the rest of the day.

Firmware Version
Hardware Version
Internet Port Type Static IP
IP Address
Subnet Mask
MAC Address 00-15-65-47-37-0F
Link Status Connected
Router IP Address
Device Type Bridge
Router DHCP Disabled
Register Status Account1 140@ : Registered

Can you help me please?
Thank you!

RE: T28 packet loss / delay error - Yealink_Peter - 12-18-2014 06:19 PM

Hello crafty,

There are many factors causing this problem, and I could not reproduce your problem from my side, could you please take one issued T28 to upgrade firmware to version: and test the result. (Please do not forget to reset phone after upgrading successfully)

Thanks and look forward to your reply.

Best Regards,