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Hi, thank you for contacting JustAnswer.com. My name is***** will do my best to provide the right answer to your question.What is your question about audio playback, please?
Try enabling the microphone in iVMS-4500. That might help!
If iVMS does not work at the audio function, would you consider trying some other software or app?
Then since you are having this problem on an iPhone, and I am not that good with iPhone problems, I have Opted Out, opening the case to other Experts in this category, one of which may have the answer you are looking for.