Teams call end with error code 410

Petri-X 

Hi there! we've been having similar issues aswell.  From what i can work out, Teams being essentially VoIP and in fact they even offer PSTN services, i think the codes reported are in fact SIP codes.

I have been looking for these error codes as 419, 487, 603 and 630 keep appearing a lot whenever a teacher reports that specific pupils are unable to attend lessons.

On another post about these response codes, someone else in the Tech Community forum posted a link to wikipedia, which explains/lists what these error codes mean where VoIP is concerned.

https://en.wikipedia.org/wiki/List_of_SIP_response_codes

I then clicked the reference articles and it shows a bit more explanation:

"(...) 

21.4.10 410 Gone

The requested resource is no longer available at the server and no
forwarding address is known. This condition is expected to be
considered permanent. If the server does not know, or has no
facility to determine, whether or not the condition is permanent, the
status code 404 (Not Found) SHOULD be used instead. (...)"

as for what it means to teams, it seems to be some kind of response failure, perhaps their connection between their teams environment and their computer.
I have not been able to recreate/ experience this on any meetings and at this moment
i can only suspect that they may be turning off the wifi on their laptops/devices as
not many are connection on wired devices, where as i am.

for other codes, i have been able to test:

For example, i created a test meeting with one of our test accounts.  As the organiser, i started the meeting and waited for the test account to join.  I then clicked Participants and clicked the test account and clicked the option "request to join".

On the device where i was logged in as the tests account, i simply let it ring. Didnt click reject, just waited for the device to stop ringing.

I did have to wait a couple of hours (usage levels for the time of day i guess) but when i checked the stats, i got Response code: 487.

For response code 603, i did the same thing, setup a test meeting, inviting a test account.

but this time, when using the test account (participant), instead of letting it ring, i clicked reject.

As the organiser i did not see any messages to suggest the call was rejected, but instead it showed "no response".

I again checked the teams stats for the test account, for that session and got Response code: 603

I did try to (as organiser) "request to join" and "reject" (as test account) and all the attempts were there and they all had the same response code.

I am unable yet (lockdown) to test with other devices, in terms of whether turning off the wifi is the cause for 410 (still not sure if its) however this error mainly presents on apple devices, so i am wondering if they connect to some apple server before connecting to teams meetings.  I find that unlikely but Teams does behave differently in apple devices.

Looking in the Advanced Tab, they tend to provide more information, including the HyperV server dns address it connects to but as for what the codes mean, its worth doing a few test calls/meetings to find out what some of them mean .