UCM6304A Audio IP PBX | 1500 Users, 200 Calls, IM & Web Meetings | Grandstream
The Grandstream UCM6304A is a powerful, audio‑only unified communication solution designed for businesses that need reliable voice, instant messaging, and audio web meetings without video complexity. Based on Asterisk version 16, this IP PBX centralizes all business audio communication – including traditional telephony, VoIP calls, IM, voice meetings, intercoms, and call center features – onto one secure network.
Key capacities:
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Up to 1500 users
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Up to 200 concurrent G.711 calls
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Up to 120 concurrent SRTP (encrypted) calls
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4 FXS ports + 4 FXO ports (analog phones and PSTN lines) with lifeline capability during power outage
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Expandable via external FXS/FXO gateways
Audio & voice features:
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Full‑Band Opus voice codec plus G.711, G.722, G.729, iLBC, T.38 fax
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Jitter resilience up to 50% packet loss – ideal for Pakistan’s varied internet quality
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Carrier‑grade line echo cancellation (128ms tail), dynamic jitter buffer, FEC 2.0
Built‑in collaboration (audio & IM):
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Instant Messaging (IM) between users
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Audio web meetings accessible from computers, mobile devices, and SIP endpoints
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Free Wave app for voice and IM on Windows, macOS, web, Android, and iOS
Security & reliability:
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Secure boot, unique certificate, random default password
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SRTP, TLS, HTTPS, SSH, 802.1X, ZRTP for media encryption
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Hot Standby High‑Availability and local dual deployment
Networking & hardware:
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Three Gigabit auto‑sensing RJ45 ports with integrated PoE+ and NAT router support
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Automated NAT firewall traversal (UCM RemoteConnect) for secure remote connections
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Compatible with GDMS for cloud setup, monitoring, and management
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USB and SD card interfaces
Call center & auto‑attendant:
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Multiple configurable call queues, ACD (skills/availability based), in‑queue announcements
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Up to 5 layers of IVR in multiple languages
API & integrations:
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Full API available for third‑party platforms including CRM and PMS systems
Operating environment:
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Temperature: 32‑113°F / 0‑45°C, humidity 10‑90%
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Universal power supply: 100‑240VAC, 50/60Hz (works with Pakistan’s 220V)
Compliance: FCC, CE, IC, RCM, UL (power adapter)
The UCM6304A is perfect for Pakistani businesses with 500‑1500 users – such as call centers, corporate offices, and multi‑branch enterprises – that need robust voice, IM, and audio conferencing without video.
Technical Specifications
Frequently Asked Questions
Q1: How many users and calls can the UCM6304A handle for my Pakistani business? +
It supports up to 1500 users and 200 concurrent G.711 calls (120 encrypted SRTP calls). Suitable for medium‑to‑large offices, call centers, and multi‑branch setups in Lahore, Karachi, Islamabad, etc.
Q2: Can I connect traditional PTCL analog lines and old analog phones? +
Yes. The UCM6304A has 4 FXO ports (for PSTN lines) and 4 FXS ports (for analog phones/fax machines). All ports have lifeline capability – they work even during a power outage. You can also add more ports using external gateways.
Q3: Can my team work remotely using their mobile phones? +
Yes. The free Wave app (Android, iOS, Windows, macOS, web) lets employees make calls, send instant messages, and join audio web meetings from anywhere. UCM RemoteConnect provides secure NAT traversal – no static IP or VPN needed.
Q4: How good is voice quality on poor internet connections common in some Pakistani cities? +
Excellent. The UCM6304A includes jitter resilience up to 50% packet loss, Opus codec, and advanced echo cancellation. Calls remain clear even on fluctuating broadband or 4G.