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Update: When I switch the device to mobile data and make the call, it seems to work fine. It's just WiFi that is giving me issues. Not sure if its a networking issue, since other codecs seem to work fine, its just OPUS that doesn't work on WiFi.

Hello, I'm playing around with OPUS, so far so good with my Yealink phones at 16kHz with 20ms ptime. I have some mobile clients (Groundwire on iOS), when I use OPUS, I'm not able to hear anything from the call on the mobile device, however when I switch to PCMU or G722, everything works fine...