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Grandstream UCM6308 IP PBX



$3,068.61 for 3 item(s)

Grandstream UCM6308 IP PBX

Grandstream UCM6308 IP PBX enables companies to create scalable unified communications and collaboration solutions. This series of IP-PBX provides a platform to integrate all business communications; such as voice, video call, video conference, video surveillance, network conference, and data transmission into a centralized network,  analysis, mobility, facility access, walkie-talkie, etc.

The UCM6300 series supports up to 3000 users and includes an integrated web conferencing and video conferencing solution that enables employees to connect via desktop computers, mobile devices, GVC series devices, and IP phones. It can be combined with the UCM6300 ecosystem to provide a hybrid platform that combines local IP PBX management with cloud-based remote access solutions.

The UCM6300 ecosystem consists of Wave applications for the Internet and mobile devices, which provide a hub for remote collaboration. UCM Remote Connect (NAT traversal service in the cloud) provides secure remote connections. API for integration with third-party platforms. This UCM6300 series provides high-quality unified communications and collaboration solutions and a series of mobile, security, conference, and collaboration tools, and is a powerful platform for any enterprise.

Grandstream UCM6308  IP-PBX

  • It Supports about 450 concurrent calls and 3000 users
  • Ensure zero configuration of Grandstream SIP endpoints
  • Built-in conferencing platform and supports Wave app, desktop, and SIP endpoints
  • Based on the open-source telephone operating system Asterisk * Version 16
  • Compatible with GDMS, configure, manage and monitor in the cloud
  • Three-gigabit autosensing RJ45 network ports with integrated PoE + and compatible NAT router
  • Automated NAT firewall traversal service facilitates secure remote connections
  • Advanced security protection with secure boot, unique certificate, and default random password to protect calls and accounts
  • Wave for Android, iOS, Chrome, and Firefox  browser allows communication with all UCM6300 users & solutions
  • Availability of API for third-party integrations, including CRM and PMS platforms

Grandstream UCM6308 – Technical Specifications


Analog Telephone FXS Ports

  • 8 RJ11 Port
  • All ports have lifeline capability in case of power outage

PSTN Line FXO Ports

  • 8 RJ11 Port
  • All ports have lifeline capability in case of power outage

Network Interfaces

  • Three self-adaptive Gigabit ports (switched, routed or dual mode) with PoE+

NAT Router

  • Yes (supports router mode and switch mode)

Peripheral Ports

  • 2*USB 3.0
  • 1*SD card interface

LED Indicators

  • Power 1/2
  • FXS
  • FXO
  • LAN
  • WAN
  • Heartbeat

LCD Display

  • 128×32 dot matrix graphic LCD with DOWN and OK buttons

Reset Switch

  • Yes, long press for factory reset and short press for reboot

Voice-Over-Packet Capabilities

  • LEC with NLP Packetized Voice Protocol Unit
  • 128ms-tail-length carrier grade Line Echo Cancellation
  • Dynamic Jitter Buffer
  • Modem detection & auto-switch to G.711
  • NetEQ
  • FEC 2.0
  • Jitter resilience up to 50% audio packet loss

Voice And Fax Codecs

  • Opus, G.711 A-law/U-law, G.722, G722.1 G722.1C, G.723.1 5.3K/6.3K, G.726-32, G.729A/B, iLBC, GSM; T.38

Video Codecs

  • H.264, H.263, H263+, H.265, VP8


  • Layer 2 QoS (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS) QoS


  • Full API available for third-party platform and application integration

Telephony Operating System

  • Based on Asterisk version 16

DTMF Methods

  • In-band audio, RFC2833, and SIP INFO

Provisioning Protocol & Plug-And-Play

  • Mass provisioning using AES encrypted XML configuration file, auto-discovery & auto-provisioning of Grandstream IP endpoints via ZeroConfig (DHCP Option 66 multicast SIP SUBSCRIBE mDNS), eventlist between local and remote trunk

Network Protocols


Disconnect Methods

  • Busy/Congestion/Howl Tone, Polarity Reversal, Hook Flash Timing, Loop Current Disconnect

Media Encryption

  • SRTP, TLS, HTTPS, SSH, 802.1X

Universal Power Supply

  • 2x DC 12V Power Jack
  • Input: 100~240VAC, 50/60Hz
  • Output: DC 12V, 2A


  • 485mm(L) x 187.2mm(W) x 46.2mm(H)


  • Unit Weight: 2550g
  • Package Weight: 3320g

Temperature & Humidity

  • Operating: 32 – 113ºF / 0 ~ 45ºC, Humidity 10 – 90% (non-condensing)
  • Storage: 14 – 140ºF / -10 ~ 60ºC, Humidity 10 – 90% (non-condensing)


  • Rack mount & Desktop

Multi-Language Support

  • Web UI: English, Simplified Chinese, Traditional Chinese, Spanish, French, Portuguese, German, Russian, Italian, Polish, Czech, Turkish
  • Customizable IVR/voice prompts: English, Chinese, British English, German, Spanish, Greek, French, Italian, Dutch, Polish, Portuguese, Russian, Swedish, Turkish, Hebrew, Arabic, Netherlands
  • Customizable language pack to support any other languages

Caller ID

  • Bellcore/Telcordia, ETSI-FSK, ETSI-DTMF, SIN 227 – BT, NTT

Polarity Reversal/Wink

  • Yes, with enable/disable option upon call establishment and termination

Call Center

  • Multiple configurable call queues, automatic call distribution (ACD) based on agent skills/availability/ work-load, in-queue announcement

Customizable Auto Attendant

  • Up to 5 layers of IVR (Interactive Voice Response) in multiple languages

Maximum Call Capacity

  • Users: 3000
  • Concurrent calls (G.711): 450
  • Max concurrent SRTP calls (G.711): 300

Maximum Attendees Of Conference Bridges

  • 8 Video Conference rooms and up to 60 parties with 1080p, assuming 4 video feeds + 1 screen sharing (H.264 & G.711)
  • Voice Conference: Up to 300 parties (G.711)

Wave Mobile App

  • Allows Android & iOS users to join UCM-hosted meetings & communicate with other users/solutions registered to the UCM6300

Call Features

  • Call park, call forward, call transfer, call waiting, caller ID, call record, call history, ringtone, IVR, music on hold, call routes, DID, DOD, DND, DISA, ring group, ring simultaneously, time schedule, PIN groups, call queue, pickup group, paging/intercom, voicemail, call wakeup, SCA, BLF, voicemail to email, fax to email, speed dial, call back, dial by name, emergency call, call follow me, blacklist/whitelist, voice conference, video conference, eventlist, feature codes, busy camp-on/ call completion, voice control

Firmware Upgrade

  • Supported by Grandstream Device Management System (GDMS), a zero-touch cloud provisioning and management system, It provides a centralized interface to provision, manage, monitor and troubleshoot Grandstream products


  • FCC: Part 15 (CFR 47) Class B, Part 68
  • CE: EN 55032, EN 55035, EN 61000-3-2, EN 61000-3-3, EN 62368-1, ETSI ES 203 021, ITU-T K.21
  • IC: ICES-003, CS-03 Part I Issue 9
  • RCM: AS/NZS CISPR 32, AS/NZS 62368.1, AS/CA S002, AS/CA S003.1/.2
  • Power adapter: UL 60950-1 or UL 62368-1

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