Bowser 0.6 from apple app store cannot see remote video between iOS.

I have downloaded the latest boser 0.6 on two iphone 6s and one iphone 5. I load the page of http://demo.openwebrtc.org:38080.

I have tried to video call each other between ios, but I failed, I cannot see the remote video frame, and sometimes I am luck I can see one remote video about 5s, then this one remote video didn't update again.

test steps:
1, download bowser 0.6 from apple app store;
2, load page of http://demo.openwebrtc.org:38080/ in iphone.
3, join one session and then call between on iphone 5/6s and iphone 6s ;

Test result:
1, we cannot get remote real video. sometime we can see about 5s one remote video.