Yet another clue could be if the audio works fine on internal calls within a single location, but not on internal calls with extensions at another location, even though it is managed on the same enterprise network.
Another symptom is when the one-way or no-way audio only occurs on incoming calls, but not on outgoing calls or internal calls to other extensions on the same network. One tell-tale sign that NAT is at the root of this issue is if there is no audio on a call that has nonetheless been successfully connected (i.e., the call timer is counting as if the call is in effect, but there is no sound).
In this article, we dive into how NAT can impair voice sessions, cite some common symptoms that indicate NAT may be at the root of your call audio problems, and address how to resolve the issues. In particular, NAT is a common cause of one-way and no-way audio on VoIP calls. One of the most common challenges involves a technology called Network Address Translation (NAT), which for data networks has been a godsend, but if not configured carefully, could cause problems for voice applications. Because of this, it can be challenging to adapt a network to accommodate voice. Unlike conventional telephony infrastructure, which was developed and tailored to be used exclusively for voice, today’s telecom networks accommodate a multitude of different data traffic types, of which VoIP is just one of many.
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