Grandstream GXW4501 Digital VoIP Gateway

Dual Gigabit network ports with a configurable integrated NAT router
30 concurrent calls, multi-language voice prompts and T.38 fax
Automated provisioning by HTTPs/TFTP with XML config files
Supports nearly all the popular voice codecs including Opus, G.722, G.711, G.729, G.723, iLBC, G.726, GSM-FR and more