Grandstream UCM6308A Audio Series IP PBX

Grandstream UCM6308A Audio Series IP PBX is a high-capacity, enterprise-grade unified communications platform designed for large organizations that require reliable, scalable, and secure voice communication systems. It delivers a powerful audio-only IP PBX solution that combines telephony, instant messaging, conferencing, remote connectivity, and cloud-based management in a single system. Supporting up to 1,500 users and 200 concurrent calls, the UCM6308A is ideal for enterprises, call centers, universities, hospitals, and multi-branch organizations that need stable and centralized communication infrastructure.

Product Features

Supports Up to 1,500 Users and 200 Concurrent Calls

The UCM6308A is engineered for high-demand environments, supporting up to 1,500 SIP users and 200 simultaneous calls, making it suitable for large-scale business communication deployments.

8 FXO and 8 FXS Ports for Hybrid Telephony Integration

It includes 8 FXO ports for connecting PSTN lines and 8 FXS ports for analog phones and fax machines, allowing smooth integration between traditional telephony and modern VoIP systems.

Integrated Unified Communications Platform

The system provides voice calling, instant messaging, audio conferencing, web meetings, analytics, mobility features, intercom integration, and facility access support within a centralized platform for streamlined communication management.

Built-In Audio Conferencing and Collaboration Tools

UCM6308A includes a built-in conferencing system that allows users to conduct audio meetings and collaborate using IP phones, mobile devices, desktop clients, or web browsers without requiring external conferencing software.

Wave App for Remote Communication

The free Wave application enables users to make calls, join meetings, and send messages from Windows, macOS, Android, iOS, and web browsers, supporting hybrid and remote work environments.

Cloud Management and Remote Access

With support for GDMS cloud management and UCM RemoteConnect, administrators can remotely deploy, monitor, and manage the system securely across multiple locations.

Zero-Touch Provisioning for Easy Deployment

Grandstream SIP endpoints can be automatically discovered and configured, significantly reducing installation time and simplifying system rollout.

Advanced Security and Encryption

The system includes secure boot, device certificates, TLS, SRTP encryption, and randomized default credentials to protect communications and prevent unauthorized access.

High Availability for Business Continuity

UCM6308A supports high availability configurations, ensuring minimal downtime and continuous communication service in critical environments.

Open API Integration

An open API allows integration with CRM, PMS, and third-party business systems, enabling automation and improved workflow efficiency.

Asterisk-Based Telephony Engine

Built on Asterisk Version 16, the system offers flexibility, reliability, and compatibility with a wide range of SIP devices and services.

Product Specifications

• Model: Grandstream UCM6308A
• Product Type: Audio-Only IP PBX System
• Maximum Users: 1,500
• Maximum Concurrent Calls: 200
• FXO Ports: 8 × RJ11
• FXS Ports: 8 × RJ11
• Voice Conference Capacity: Up to 150 participants
• Conference Rooms: Up to 9
• Network Interfaces: 3 × Gigabit Ethernet ports with PoE+
• NAT Router Support: Yes
• USB Ports: 2 × USB 3.0
• Storage: 1 × SD card slot
• Display: 128 × 32 LCD display
• Operating Platform: Asterisk Version 16
• Voice Codecs: Opus, G.711, G.722, G.729A/B, iLBC, GSM
• Fax Support: T.38
• Security Protocols: TLS, SRTP, HTTPS, SSH, 802.1X
• Provisioning: Zero-touch provisioning
• Cloud Support: GDMS and RemoteConnect
• Installation Type: Rack or desktop mount
• Operating Temperature: 0°C to 45°C
• Ideal For: Large enterprises, call centers, universities, hospitals, hotels, and multi-branch organizations

Use Case Scenarios

•  Multi‑office enterprises with heavy call traffic.
•  Organizations needing unified voice, conferencing, and messaging.
•  Remote workplaces leveraging Wave App & UCM RemoteConnect.
•  Businesses requiring secure and scalable communications infrastructure.

Benefits and Integrated Technologies

• Wave App: A free application for computers (Desktop/Web) and mobile phones (Android/iOS) that allows employees to communicate and make calls from anywhere.
• UCM Remote Connect & GDMS: Compatible with the Grandstream Device Management System (GDMS) cloud-based system for remote configuration, monitoring, and management with advanced security.
• Advanced Protection: Includes robust network protection through Secure Boot technologies, unique security certificates, and a NAT Firewall anti-hacking system.
• Call Center Systems: Supports call queueing and call distribution to agents based on their skills or availability (ACD).
• External Application Integration: Provides a custom API that allows this platform to be integrated with other business systems such as customer relationship management (CRM) and hotel management systems (PMS

Included in the Box

Depending on distributor, typically includes:

• UCM6308A IP PBX appliance

• Ethernet cable

• Power adaptor(s)

• Quick Installation Guide‘