Yep, H264 required for iOS unfortunately. I wrote up some documentation on how to configure Verto for H264:

https://evoluxbr.github.io/verto-docs/tut/adding-h264-support.html

On Sun, Jul 1, 2018 at 6:52 AM Giovanni Maruzzelli <gmaruzz@gmail.com> wrote:
I believe Safari do support webrtc in current ios, it just do not support vp8, h264 only.


On Thu, Jun 28, 2018, 23:38 Francesco Facco de Lagarda <francesco@delagarda.com> wrote:
iOS safari dies not support webrtc yet....
Apple keeps promising but....

Francesco Facco de Lagarda


> On 28 Jun 2018, at 09:30, 王聡 <cong.wang.itsherpa@gmail.com> wrote:
>
> Hey all,
>
> I had tried to build a WebRTC video call service via mod_verto and Verto Comunicator.
> Now I could make calls from (to) an Android device with Chrome, but it didn’t work on iOS with Safari.
> Is there any point to be modified to run on Safari?
>
> Regards.
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