Forum Discussion

Brass Contributor

Sep 28, 2022

Teams devices (deskphones) Throwing 488 error regarding media bypass

Have a Direct routing setup that is using media bypass. Calls using PC client or web client are fine. Calls using any model\mfg of Teams phone throws the following every 10 minutes and then the cal...

calling

microsoft teams

Attila Kovács

Copper Contributor

Oct 04, 2022

DayneJake
I'm just receiving the same reply from Microsoft when a re-invite from PSTN (Proximus) is relayed back by AudioCodes SBC to Microsoft cloud.
Interestingly this only affects native Teams clients, browser-based Teams clients work fine. The reason must be that browser-based clients do not support media bypass.

Not all calls fail, currently what I know are emergency test calls to 117 in Belgium, after entering a DTMF digit. I could not get other numbers to fail yet.

The re-invite looks completely normal, with public IP in the SDP "c=" parameter.
I need to open a ticket at Microsoft.

Marco1187
Copper Contributor
Dec 15, 2022
Attila Kovács
Hi, is there already an update or a solution provided by Microsoft. It looks like we have a similar behaviour in our environment.
- GouravK715
  Copper Contributor
  Sep 22, 2023
  Marco1187 I am facing similar issue in our environment but instead of 488 Un-acceptable media, we are getting 491 Gone here. We have raised case with microsoft, but no luck.
DayneJake
Brass Contributor
Oct 04, 2022
We turned off Media Bypass on the SBC and also in TAC. The call does not drop and we do not see the 488. Microsoft still working on the ticket.