IP telephony problems with VPN Zerotier

Very good morning Dear

Along with saying hello, I tell you that we are a company from Chile, specifically Raylex Representaciones y Servicios S.A. Some time ago I implemented this router in the networking solutions of our projects, however, we had the following problem. "When transferring IP telephony, from one Cisco router to another, through 2 teltonika routers connected to the internet via 4G, with zero-tier VPN, the problem is that IP telephony does not currently pass from one side to the other .

According to the above, we need help to solve this problem and continue implementing these routers in our projects.

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