How configure remote extention to Elastix behind a router with two WAN addresses?

Hello dear team and memders!

I have a router TP-Link Archer MR200 is bonded PBX Elastix. This router is connected to a external ISP with static WAN IP and a SIM card for mobile internet as a backup if break ISP.

The problem is with the remote extensions that are connected successfully with the PBX with a static IP Internet provider. But when internet interrupt and join the mobile Internet is changing IP address and remote exrensions can not connect to the PBX.
Please give me advice on how to set up the router, PBX and external number.

Thank you very much in advance!

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