Sometimes when I press the push & talk button in my ios app, after I say my message I hear two sounds - the first higher pitched than the second. It sounds to me like its trying to tell me something has gone wrong. So I think, oh - the message must have not gone through. But then my son answers me and obviously got the message. What do these sounds mean and is there a guide that explains all the sound feedback you get? Thanks.
It literally means that your app never got the message back from the Relay acknowledging that it received the message. The receiving party reports back if the message was played. What probably happened was the return played response was delayed or lost.