Peplink deployed Drop in mode on HQ and LTE wan connection on remote site

Hi Admin,

I have deployed Peplink balance 380 drop in mode on HQ and peplink balance 310 on remote site using DSL connection. I have configured Speedfusion VPN. I can Ping both peplink but not the network on HQ.
Peplink on HQ is in drop in mode
Peplink on remote site is not drop in mode

Need help please