How to NAT polycom in LAN network to outsite via Peplink and sophos firewall

Dear my friends,
My company have polycom in LAN and we want to NAT polycom via Peplink 710.
So port I need to open : 1720, 5060, 5061, 3230-3235, 3230-3280
I try to NAT inbound and outbout but can’t.
Anyone can help me in this case ?
Thank you.
My Skype : khanhnguyen111185