Grandstream GXW4248 High Density FXS VoIP Gateway

Grandstream GXW4248 High Density FXS VoIP Gateway

The Grandstream GXW4248 is a high-performance 48-port FXS VoIP gateway designed to bridge analog telephony systems with modern IP-based networks. It features both RJ‑11 and 50‑pin Telco connectors, Gigabit Ethernet support, and a front-mounted LCD display. The GXW4248 supports dual SIP server profiles, per-port SIP account assignments, advanced telephony and security features, and built-in NAT routing. This gateway is ideal for migrating analog telephone systems to VoIP in SMBs, multitenant properties, or branch offices.

Grandstream GXW4248 High Density FXS VoIP Gateway Specifications

• FXS Ports: 48 RJ‑11 analog ports with dual 50‑pin Telco support

• Network Interface: 1 × auto-sensing Gigabit Ethernet RJ‑45 port

• LCD Display: Backlit 128 × 32 graphic LCD, multi-language supporthttps://www.city.co.ke

• SIP Profiles: Up to 4 SIP server profiles per unit, each port supports independent SIP account

• Voice Codecs: G.711 μ/a-law, G.723.1, G.726 (40/32/24/16), G.729A/B, iLBC, Opus support

• Fax Support: T.38 compliant up to 14.4 kbps with automatic G.711 fallback; V.17/V.21/V.27ter/V.29 T.38 modem pump

• Echo & Jitter Control: Carrier-grade G.168 echo cancellation with 128 ms tail; dynamic jitter buffer with modem detection and auto-switch to G.711https://www.city.co.ke

• Telephony Features: Caller ID support/block, call waiting, transfer, forward, DND, 3-way conferencing per port, last-call return, paging, message waiting indicator via LED or tone, flexible dial plan

• QoS & VLAN: DiffServ, TOS, 802.1p/q tagging for traffic prioritization

• Network Protocols: Supports TCP, UDP, RTP/RTCP, HTTP/HTTPS, ARP, ICMP, DNS, DHCP, NTP, TFTP, Telnet, PPPoE, STUN, and LLDP

• DTMF Methods: In-audio, RFC 2833, SIP INFO options supported

• Security & Provisioning: TLS/SIPS, SRTP, HTTPS for management; TR‑069, TFTP, HTTP, HTTPS, and encrypted XML provisioning; 802.1x support; secure boot with unique certificate

• Power Supply: 24 V DC, 6.25 A universal input power (100–240 VAC)

• Protection Standards: ITU‑T K.21 over-voltage and over-current protection

• Environmental Range: Operating temperature 0 °C to 40 °C; storage −20 °C to 60 °C; 10% to 90% non-condensing humidity

• Physical Specs: 1 U rack-mount (440 × 255 × 44 mm); approx. 3.21 kg net weight

• Mounting Options: Rack or desktop mount with included brackets

• Compliance & Warranty: FCC, CE, RCM, UL, RoHS certified; typically 1-year standard and up to 3-year regional warranty