No licences because it's a third party equipment. You need to have a SS with H323 or SIP virtual trunk, a NRS (GK) configured
Basicaly, you have to give it:
an ip address
h323 or sip name
a DSC
Configure it with the GK IP@
On pbx side:
DSC pointing to Virtual trunk
In NRS:
Routing entry going to ATA gateway endpoint
More details are in the Audiocodes docs.