Description
The MP508/4S4O/SIP hits the sweet spot for hybrid environments that aren’t ready for a full IP phone rollout. With four FXS ports for analog phones or fax machines and four FXO ports for connecting to the PSTN or legacy trunks, it gives you maximum flexibility in a single compact unit. We love the built-in standalone survivability — if your internet goes down, your phones keep working. Add zero-touch provisioning and you’ve got a gateway that IT teams can deploy at scale without hours of manual configuration. It’s certified for Microsoft Teams Phone via the SIP Gateway and plays nicely with just about every major SIP platform out there. If you’re tired of juggling separate devices for FXS and FXO, this mixed-port model is the clean, future-proof solution you’ve been looking for.
Please note: SBC sessions, Direct Routing Teams Integrations, high level features, and access to Audiocodes support may require an additional license or support contract.
Key Features
- Mixed 4 FXS + 4 FXO ports — Connect analog phones, fax machines, modems, and PBX trunks all from one box
- Superior voice quality — Support for G.711, G.729A, G.722, and G.723.1 codecs with echo cancellation, silence suppression, and dynamic jitter buffer
- T.38 real-time fax — Reliable fax-over-IP with automatic fallback to PCM when needed
- SIP interoperability — Works with Microsoft Teams Phone, Zoom, Cisco BroadSoft, Metaswitch, and virtually any SIP-based PBX or trunk
- Standalone survivability (SAS) — Keeps calls alive during WAN outages
- Security you can trust — SRTP encryption, TLS, and SIP header manipulation for protected communications
- Zero-touch provisioning — Deploy dozens of units quickly with AudioCodes One Voice Operations Center or TR-069
- Rich analog features — Message Waiting Indication (MWI), caller ID in multiple formats, polarity reversal, metering tones, and distinctive ringing
- Dual Gigabit Ethernet — One WAN port + one LAN port for flexible network setups
- Compact & easy to mount — Tabletop, wall-mount, or optional rack shelf — perfect for tight spaces
Technical Specifications
- Model: MP508/4S4O/SIP
- Analog Interfaces: 4 FXS (loop start) + 4 FXO ports
- Voice Codecs: G.711, G.723.1, G.729A, G.722
- Fax: T.38 compliant (version 3), automatic bypass to PCM
- Network: 1 × 10/100/1000 Mbps WAN Ethernet + 1 × 10/100/1000 Mbps LAN Ethernet
- Power: 100–240 V AC, 50–60 Hz, 0.8 A input; 12 V DC / 3 A output
- Dimensions (H × W × D): 51 × 296 × 160 mm (2.01 × 11.65 × 6.30 in)
- Weight: 670 g (1.48 lb)
- Operating Temperature: 5–40 °C (41–104 °F)
- Mounting Options: Desktop, wall mount, rack mount (optional shelf)
- Management: Web GUI, SNMP v2/v3, SSH, Telnet, TR-069, zero-touch provisioning
- Compliance: CE, FCC, UL 62368-1, ITU-T K.21 surge protection on FXS ports
See Audiocodes MP-5xx datasheet for more information.