Cisco CP-3905 Unified SIP Phone — Reliable, Budget-Friendly IP Communications

Save up to 70% on the Cisco Unified SIP Phone 3905 with Reef Telecom's certified refurbished units, backed by our industry-leading 10-year warranty. The CP-3905 is a cost-effective, single-line VoIP phone designed for cubicles, retail counters, classrooms, manufacturing floors, hallways, and wall-mounted deployments.

Key Specifications

• Part Number: CP-3905
• Phone Lines: Single-line with support for 2 concurrent calls
• Display: 128 x 32 pixel monochrome LCD with 2-way navigation
• Speakerphone: Full-duplex speakerphone with mute
• Protocol Support: SIP (for Cisco Unified Communications Manager 7.1.5+)
• Ethernet: Dual-port 10/100 Ethernet switch (LAN + PC passthrough)
• Power: PoE Class 1 (802.3af) — no separate power supply required
• Fixed Feature Keys: Hold/Resume, Redial, Transfer, Mute
• Headset Port: 1x RJ-9 headset jack
• Mounting: Desktop stand or wall-mountable (foldable stand included)
• Audio Codecs: G.711 µ/A-law, G.729a/ab
• Message Waiting: Lighted message waiting indicator (MWI)
• Eco-Friendly: Built with reground and recyclable plastics

Ideal Use Cases

The Cisco 3905 is the perfect entry-level IP phone for organizations deploying Cisco Unified Communications at scale. Deploy across common areas, lobbies, break rooms, classrooms, retail locations, and warehouse floors where basic, dependable voice communication is needed without the cost of a full-featured handset.

Compatible with: Cisco Unified Communications Manager 7.1(5)+, CUCM Business Edition 3000/5000/6000. Supports SIP protocol only — not compatible with third-party call-control systems.

🚚 Free shipping on orders over $300 | 🛡️ 10-year warranty on all refurbished equipment | 📞 Expert telecom support from Reef Telecom

Free ground shipping on orders over $300. Same-day shipping on orders placed before 4PM EST.

All products include our industry-leading 10 Year Warranty backed by Reef Telecom.