GXW4504

Here’s a detailed overview of the Grandstream GXW4504 — a high-capacity Digital VoIP Gateway for connecting E1/T1/J1 PSTN or ISDN trunks to SIP networks:

🧩 Core Features & Specs

• Port Configuration

  • 4 software‑configurable E1/T1/J1 RJ‑45 spans

  • Supports PRI, SS7, MFC‑R2 signaling

  • Enables up to 120 simultaneous VoIP calls 

• Network Interfaces

  • Dual Gigabit Ethernet (WAN/LAN), supports NAT routing 

• Voice/Fax Support

  • Codecs: G.711, G.722, G.723.1, G.726, G.729 A/B, iLBC, Opus

  • FAX relay: T.38 (Group 3, up to 14.4 kbps) with G.711 fallback 

• Audio Quality & QoS

  • Echo cancellation (G.168), dynamic jitter buffer, VAD/CNG, packet loss concealment

  • Layer 2/3 QoS support including 802.1p, DiffServ, MPLS 

• Security & Provisioning

  • SIP over UDP/TCP/TLS, SRTP, HTTPS, SSH

  • Auto-provisioning via HTTP/TFTP/xml config

  • Integrated NAT router, robust encryption 

• Extras

  • 128×32 LCD for monitoring/configuration

  • USB 3.0 ports (×2), SD card slot 

• Power & Form Factor

  • Universal PSU (100–240 VAC → 12 V DC, 2 A)

  • 1U rack-mountable (desktop form available)