Can't hear anything when calling from iPhone 6Plus

Question

I've got the Zoiper Business that I bought from the iTunes store.  I can dial out and have tested on two office phones (just to make sure that they would ring when dialed).  However, there is no audio.  The call connects, but it is dead.

Answer 1

Have you checked this tutorial:

http://www.zoiper.com/en/support/answer/for/ios/19/SIP_-_No_audio_or_one_way_audio