Problem with remote extensions audio and registering

I have a problem registering remote extensions, the audio is not heard:

I send you the detail of the network design:

Site 1:

- 4 Phones Fanvil
- Network (these phones doesn't register)
- Peplink router (VPN device1)

Middle Site:

- Watchguard Firewall (VPN device2)


- Connect trought MPLS to the midle site
- PBX and 6 phones (these phones get register very well)
- Network

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