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Caller-id after attended transfer not working properly on T19P/T41P
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ddyx Offline
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Posts: 5
Joined: Oct 2015
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Post: #1
Caller-id after attended transfer not working properly on T19P/T41P

I have read many posts about this issue and have tried the proposed solutions to no avail.

I'm using a T19P (E2) phone and a T41P phone for the tests. So, the scenario is similar as described on other posts:
1. Incoming call to T19P
2. T19P answers
3. T19P makes a new call to T41P
4. T41P answers
5. T19P performs an attended transfer
6. Caller id shown on T41P's display still shows T19P data and does not update with the original incoming call caller id (name/number)

My first tests were on some of the 80s firmware versions, then I upgraded both phones to the latest 82, because the only documentation that confirmed the existence of the "refresh_remote_id" parameter was on the autoprovisioning template files of the version 82.

After provisioning both phones with this new parameter enabled (through autoprovision), I downloaded the configuration in order to check if the parameter was or wasn't configured, and it turned out that it didn't appear on the downloaded configuration. I tested in spite of this evidence, and of course it didn't work.

Since there is no documentation about what RFC this new parameter supports, it's even more difficult to make modifications on my system to satisfy Yealink phones limitations (for example RFC 5876 doesn't seem to be supported, and it would be of great help to use PAI on UPDATE requests instead of FROM).

I still haven't tested it on other phone models, but I need this to work on these.

Best regards.
01-31-2018 01:17 PM
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Caller-id after attended transfer not working properly on T19P/T41P - ddyx - 01-31-2018 01:17 PM

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