The main culprit is the way NAT networks (like your typical home or office router) distribute one internet connection to multiple PC's and phones. To make this possible, they use a method called port mapping.
Without going into details (you can read moreĀ hereĀ on this), it causes the ports used by VoIP programs to change in a mostly unpredictable way and can often result in one-way or no audio, failed incoming calls, automatic hangup after 30s and more, challenges with transfers and internal calls.
On Windows:
Open the Command Prompt (CMD)
Do a traceroute e.g. tracert google.co.za
If the first 2 hops are of the local IP addresses then there is double natting
If the first 2 hops are of the local IP addresses then there is double natting
In a Mac Book
Open the Terminal
Do the traceroute
- Also, you can try to remove the second router or switch, etc, and test
For further reading Check these articles : What is double NAT and why is it bad? A Complete Guide On How To Identify And Resolve Double NAT Problems
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Can't quite figure it out or get it right? Call our Customer Happiness Team at 021 012 5000Ā or send an email toĀ info@voys.co.za