Grandstream SIP-Gateway GXW-4504 – 4x E1/T1/J1, 120 concurre

– Software configurable E1/T1/ J1 ports, support PRI, SS7, MFC R2 – Dual Gigabit auto- sensing RJ45 network ports with integrated NAT router – Supports a wide- range of voice codecs, including Opus, G.722, G.729, iLBC – TLS and SRTP security encryption technology to protect calls and accounts – Automated provisioning by HTTP/TFTP with XML config files – Supports T.38 Fax for creating Fax-over-IP – Supports multi- language voice prompts