Grandstream UCM6304A Audio Series IP PBXs$ 93.25 Grandstream UCM6304A Audio Series IP PBXs The UCM6304A is part of Grandstream’s UCM6300 Audio series—on‑premise IP‑PBX appliances designed for unified business communications. It combines voice, instant messaging, audio conferencing, facility access, and mobility into a single scalable system. It includes the free Wave App for desktop, mobile, and SIP endpoint connectivity Grandstream UCM6304A Audio Series IP PBXs Specifications User & Call Capacity Up to 1,000 users Supports 150 concurrent calls (standard) Supports 120 concurrent SRTP encrypted calls Conferencing Up to 7 audio conferencing bridges Maximum of 120 conference participants Analog & Telephony Ports 4 FXS ports (for analog phones) 4 FXO ports (for PSTN lines) Lifeline support on FXS/FXO ports Network Interfaces 3 Gigabit RJ45 ports (LAN/WAN/Configurable modes) Supports NAT router mode, dual IP mode PoE supported on applicable ports Peripheral Connectivity 2 × USB 3.0 ports 1 × SD card slot Display & Controls 320×240 color LCD screen with touch navigation Multi-function reset button (factory reset/reboot) Audio and Fax Codec Support Opus, G.711 μ/a-law, G.722, G.729A/B, G.723.1, iLBC, GSM T.38 Fax, Pass-Through Fax Acoustic echo cancellation, jitter buffer, and packet loss concealment VoIP Protocols & Network Support SIP, RTP, SRTP, TLS, TCP/UDP, DHCP, NTP, LDAP, IPv6 VPN (OpenVPN, L2TP), 802.1X authentication Layer-2 and Layer-3 QoS Security Features Secure boot and unique certificates SRTP, TLS, HTTPS encryption Fail2ban, DoS protection, firewall rules Randomized default passwords Call Features & Management Call routing, call queues, IVR (multi-level), ring groups Voicemail, call forwarding, call parking, paging/intercom Recording, fax-to-email, DND, BLF, caller ID ACD with skill/workload-based routing Provisioning & Integration Zero-Config auto-provisioning Compatible with Grandstream GDMS cloud platform Full API access for CRM/PMS and third-party integration Supports LDAP directory, push provisioning Power Supply Input: 100–240V AC, 50/60Hz Output: 12V DC, up to 2A Hardware Form Factor Dimensions: 270 × 175 × 36 mm Weight: approx. 0.75 kg Mountable on desktop or rack Operating Environment Operating temperature: 0°C to 45°C Storage temperature: -10°C to 60°C Humidity: 10% to 90% non-condensing Certifications & Compliance FCC, CE, RCM, ITU-T K.21 Meets international safety and EMC standards Related products Grandstream UCM6304A Audio Series IP PBXsSelect options Yeastar P570 P-Series IP PBXSelect options Yeastar Neogate TG800 – 8 Port GSM VoIP GatewayAdd to cart Yeastar EX08 Expansion CardSelect options This product has multiple variants. The options may be chosen on the product page Yeastar P560 VoIP PBX Phone SystemAdd to cart