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Backlight lights up based on SIP session expire
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CFortC Offline
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Posts: 7
Joined: Apr 2014
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Post: #7
RE: Backlight lights up based on SIP session expire
Yesterday I reviewed every setting on both the T48G and the T48S, and also reviewed every setting on the VoIP provider's web site for account settings, for both accounts. I found a few settings that might not be 100% copacetic and adjusted those. Examples include: DHCP priority for time setting (I prefer NTS), G.911u CODEC offered by provider (not supported by Yealink phones), etc. - pretty minor stuff, hopefully not impacting the issue, but I cleaned them all up anyway.

In the course of the day, I also discovered the actual issue, which following my clean-up, now appears only on the T48G. It turned out to be an uncontrolled external factor: the presence of unread voicemail in the VoIP account.

In summary, with unread voicemail pending in the account, the T48G backlight turns on regularly. This applies to both of the VoIP accounts (the reason I hadn't observed it from the first account was that it was set up to delete the voicemail when sending an email notification of the voicemail). The workaround is to set Account => Advanced => Voice Mail Display to Disabled (account.X.display_mwi.enable = 0). I give up the flashing LED when there is a waiting voicemail but with my email notifications I can live with that.

Although I thought I observed the same issue on the T48S, the backlight ON issue is no longer present there. It's OK to leave Voice Mail Display enabled, and the flashing LED works fine. Perhaps the settings cleanup fixed it, or some other factor intervened of which I'm still unaware, but the issue is gone now. Or perhaps the issue was never there, though that is not what I recall seeing.

The T48G is running T48-, the latest firmware available and likely the last version to be released for this end-of-life model.

The T48S is running T46S(T48S,T42S,T41S)-, not the very latest but I'll probably go ahead and bring it up-to-date now that I think I understand the issue.

Thanks to all who replied with suggestions and questions!
09-11-2020 01:29 PM
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RE: Backlight lights up based on SIP session expire - CFortC - 09-11-2020 01:29 PM

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