[Asterisk-Users] Question about setup Grandstream HandyTone 488 SIP with Astersik to Travel throught NAT.

[Maps]

Dear Supporters!

Is it posible to setup the Grandstream HandyTone 488 SIP ATA FXO FXS to travel throught that NAT to connect to Asterisk inside the other NAT?
The setup is HandyTone 488 ----------<NAT>------------Internet------------------<NAT>-----------------Asterisk.
If it works, what type of NAT should I use, and how can i configure it.

Thank you in advance for your helps.

Ian.
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