Grandstream UCM6303 Unified Communication & Collaboration Solution

The Grandstream UCM6303 is a high-performance unified communications system that enables businesses to seamlessly manage voice, video, data, and collaboration across a centralized platform. Built for scalability, flexibility, and security, it supports up to 2,000 users and 300 concurrent calls, making it ideal for medium to large enterprises. Integrated with the UCM RemoteConnect service and the Wave App, the UCM6303 delivers hybrid on-premise and cloud communication for teams working anywhere in the world.

With advanced security, built-in video conferencing, and third-party API integration, the UCM6303 provides a reliable and secure collaboration ecosystem for modern organizations.

Product Features

Scalable Unified Communication Platform

Supports up to 2,000 users and 300 concurrent calls, unifying voice, video, web meetings, instant messaging, analytics, and mobility into one powerful network.

Built-in Video Conferencing and Collaboration

Includes integrated video conferencing and web meeting features that support up to 15 simultaneous meeting rooms and 200 total participants, accessible from desktop, mobile, or SIP endpoints.

UCM RemoteConnect Cloud Service

Provides a hybrid communication solution that merges on-premise IP PBX control with secure cloud-based remote access, eliminating complex VPN setups through automated NAT firewall traversal.

Advanced Security and Reliability

Features secure boot, unique device certificates, and random default passwords, combined with Hot Standby High-Availability support to ensure continuous operation and data protection.

Seamless Integration with Third-Party Systems

Open API allows easy integration with CRM, PMS, and management platforms, streamlining workflows and improving customer engagement.

Zero Configuration and Centralized Management

Automatically discovers and provisions Grandstream IP endpoints via ZeroConfig and integrates with GDMS for remote monitoring, setup, and firmware management.

High-Quality Audio and Video

Supports Full-Band Opus, G.722, and G.729A/B audio codecs, and H.265/H.264/VP8 video codecs, delivering HD-quality communication with jitter resilience up to 50% packet loss.

Wave App Integration

The Wave App connects users from desktop, web, or mobile, allowing them to make calls, join video meetings, and collaborate seamlessly across the UCM6300 ecosystem.

Product Specifications

• Model: UCM6303
• Users: Up to 2,000
• Concurrent Calls (G.711): Up to 300
• Concurrent SRTP Calls: Up to 200
• Meeting Rooms: Up to 15 simultaneous public rooms
• Max Conference Participants: 200 combined
• Video Feeds per Room: Up to 9

Interfaces

• FXS Ports: 4 RJ11 ports (lifeline capable)
• FXO Ports: 4 RJ11 ports (lifeline capable)
• Network Ports: Three self-adaptive Gigabit RJ45 (PoE+, switch/router/dual mode)
• Peripheral Ports: 2 × USB 3.0, 1 × SD card interface

Display & Indicators

• 320 × 240 Color LCD touchscreen with shortcut keys and scroll bar
• Power, FXS, FXO, LAN, WAN, Heartbeat LEDs

Voice & Video

• Audio Codecs: Opus, G.711 A-law/U-law, G.722, G.723.1, G.726-32, G.729A/B, iLBC, GSM
• Video Codecs: H.265, H.264, H.263, H.263+, VP8
• Line Echo Cancellation: 128 ms-tail-length carrier-grade with NLP
• Jitter Resilience: Up to 50% audio packet loss
• DTMF Methods: In-band audio, RFC2833, SIP INFO

Networking

• NAT router (supports router and switch modes)
• Protocols: SIP, TCP/UDP/IP, RTP/RTCP, STUN, SRTP, TLS, DHCP, PPPoE, LDAP, IPv6, OpenVPN

Security

• Media Encryption: SRTP, TLS, HTTPS, SSH, 802.1X, ZRTP
• User Protection: Secure boot, unique certificates, random default passwords

System & Software

• Operating System: Asterisk version 16
• Provisioning: AES-encrypted XML configuration, ZeroConfig, GDMS cloud management
• QoS: Layer 2 (802.1Q/802.1p) and Layer 3 (ToS/DiffServ/MPLS)

Power & Physical

• Power Input: 100–240 VAC, 50/60 Hz
• Power Output: DC 12V, 2A
• Dimensions: 485 × 187.2 × 46.2 mm
• Weight: Unit 2.49 kg, Package 3.26 kg
• Mounting: Rack or desktop

Environmental

• Operating Temperature: 0–45°C
• Storage Temperature: -10–60°C
• Humidity: 10–90% (non-condensing)

Certifications

• FCC, CE, IC, RCM
• Power Adapter: UL 62368-1

Multi-Language Support

• Web UI: English, Spanish, Chinese, French, German, Russian, Italian, Portuguese, Turkish, Polish, Czech
• IVR/Voice Prompts: English, Chinese, French, Arabic, Dutch, German, Greek, Italian, Spanish, Turkish, Russian, Swedish, Hebrew