VoIP transmissions all have some delay due to conversion from analog voice to digital packets. Adding additional cryptography may increase this delay. However, the real answer is whether or not the delay is acceptable. More than likely, the two people talking will not be looking at each other and therefore the delay is not as noticeable. If you have the right equipment it should be acceptable. I would suggest that when you are working with your vendor, you ask to try a system that is already installed somewhere else or arrange for a demo period where you can try it out. There are several factors that will come into play including equipment, distance, etc.
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