AudioCodes MP204B/4S/SIP - SIP - IPv4 - TCP/UDP - ICMP - ARP - RTP - RTCP - PPPoE - PPTP - L2TP - DNS - Dynamic DNS - STUN - DHCP... - SIP(RFC 3261) - 10,100,1000 Mbit/s - IEEE 802.1Q,IEEE 802.1p - Ethernet (RJ-45)

Connecting legacy analog phones, fax machines, and modems to a modern IP network can be a challenge, but the AudioCodes MP204B/4S/SIP makes it simple. This compact 4-port analog VoIP gateway bridges the gap between traditional telephony and SIP-based VoIP, letting you keep your existing equipment while enjoying the benefits of IP communications.

Who is it for

Small offices, remote branches, and businesses migrating to VoIP will appreciate this gateway. It is ideal for connecting up to four analog devices—such as phones, faxes, or door entry systems—to an IP PBX or hosted VoIP service. IT administrators will value its robust protocol support and easy management.

Main features

• Four FXS ports for analog phones, fax machines, or modems
• Full SIP (RFC 3261) support for seamless integration with VoIP platforms
• Gigabit Ethernet (10/100/1000 Mbit/s) for high-speed network connectivity
• Advanced networking: PPPoE, PPTP, L2TP, DHCP, DNS, Dynamic DNS, STUN
• VLAN tagging (IEEE 802.1Q) and QoS (IEEE 802.1p) for traffic prioritization
• Supports RTP/RTCP for real-time media streaming
• Web-based management for easy configuration and monitoring

Specifications

• Product type: Analog VoIP Gateway
• VoIP protocol: SIP (RFC 3261)
• Number of FXS ports: 4
• Network interface: Ethernet (RJ-45)
• Ethernet speed: 10/100/1000 Mbit/s
• IP version: IPv4
• Transport protocols: TCP, UDP
• Network control protocols: ICMP, ARP
• Media protocols: RTP, RTCP
• WAN connectivity: PPPoE, PPTP, L2TP
• Naming services: DNS, Dynamic DNS
• NAT traversal: STUN
• IP address assignment: DHCP Client
• VLAN support: IEEE 802.1Q
• QoS: IEEE 802.1p

Tips

To ensure reliable fax transmission over VoIP, configure the gateway to use T.38 fax relay if supported by your service provider. For optimal voice quality, prioritize RTP traffic using QoS settings on your network switches and routers.