No audio on Inbound and outbound calls at a hotel

I am in a hotel, they have internet via Ethernet I hook up my linksys router and one cable goes to my trixbox and the other to my Grandstream GXP2100, the phone register by when I make an outbound call there is no audio and when I recieved an inbound call there is no audio, in the sip.nat.config I put the hotel IP address of the hotel in the externip, please help…

You are NATing twice, this will never work right.

Either use a VPN or IAX protocol.

I use VPN and softphone, You could use an IAX softphone like Zoiper

I got it to work on the outbound but the inbound does not work?