Zerotier IP telephony problems

Very good afternoon Dear

I would like help. I have the following scenario; IP telephony with two Cisco routers with call managers, which are linked by zerotier, through 2 teltonika RU240 routers, however, when I make the IP call between the Cisco routers the call does not go through, however when I make the interconnection through Any other means if the call is made, that is, the dialing pattern works, can you please help me.

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