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Error q.850 cause=17
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complex1 Offline
3CX Adv. Cert. Engineer

Posts: 1,536
Joined: Jan 2014
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Post: #2
RE: Error q.850 cause=17
(04-11-2024 07:04 AM)Nomads Wrote:  Hi All.

Have strange problem. User with extension 807 is unable to call extension 814. Error q.850 cause=17 is displayed on the phone. All the other phones (same model) can call the extension without any problems. I changed the phone's assigned extension 807 to 812 (spare) and now she can call 814! Have checked the phone settings and extension settings and cannot find any reason why extension 814 is blocking(dropping) incoming calls from 807!
Has anyone come across this problem before?


Hi Rob,

Please reset the device to factory settings and then test whether the issue has been resolved.

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.
04-11-2024 06:38 PM
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Messages In This Thread
Error q.850 cause=17 - Nomads - 04-11-2024, 07:04 AM
RE: Error q.850 cause=17 - complex1 - 04-11-2024 06:38 PM

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