NetLink Unified VoIP Gateway PBX1500 is a core voice gateway of your unified communications (UC) solution. Based on the X86 platform, it allows users to install third-party PBX software with simple installation. Equipped with modular & hot-swappable interface boards of FXS/FXO/E1/T1 and an open API, users can flexibly connect with SIP trunks, PSTN, legacy PBX, analog phones, fax machines, and IP phones according to their needs.



PBX1500 is a high-reliability gateway with redundant power supplies and hot-swappable interface boards. For vertical users who are seeking to make use of their own secure PBX software and to leverage unified communications technology to enhance communication and improve efficiency, while high reliability and availability are also critical, PBX1500 is an ideal choice.


What is Hosted PBX? | Sarvosys



Key Features

  • Key Component of IP Telephony & Unified Communications
  • Open Hardware Platform based on X86
  • Easy to install 3rd party IP PBX such as Asterisk, Free switch,   3CX, Issabel, VitalPBX software
  • Open API
  • Perfect for Vertical markets
  • Voice, Fax, Modem & POS
  • Up to 4 interface boards, Hot-swappable
  • Up to 16 E1/T1 ports
  • Up to 32 FXS/FXO ports
  • Redundant Power Supplies


PBX Business Phone System based on VoIP | CloudTalk


Open Hardware Platform for IP PBX

  • Platform-based on X86
  • Easy to Install 3rd Party IP PBX such as Asterisk, Freeswitch, 3CX, Issabel, VitalPBX Software
  • Open API
  • Install Your IP PBX Software, Match Your Applications
  • IP PBX Solution for Industry Verticals



Hardware Specification

  • MCU: 1* Main Control Unit, Hot plug HDX: 1* Ext. Hard Disk Unit, Hot plug
  • SCU: 2* Switch Control Unit, active/standby DTU: 4* E1/T1 ports, up to 4 boards
  • FXS: 8* FXS ports, up to 4 boards FXO: 8* FXO ports, up to 4 boards 4S4O: 4*FXS+4*FXO, up to 4 boards PWR: 1* 110~220VAC power modular FAN: 1* FAN cooling modular

MCU (Main Control Unit)

X86 structure control unit with two hardware configuration options:


  • CPU: Intel J1900 2.0GHz, 4 cores Intel E3845 1.9GHz, 4 cores
  • RAM: DDR3L 1600MHz 8GB


  • CPU: Intel i5-6300U 2.4GHz, dual cores RAM: DDR4 2133MHZ 32GB
  • Network: 10/100/1000Mbps Gigabit LAN 1* HDMI video connector
  • 1* USB 2.0
  • 1* USB 3.0
  • 128GB SSD hard disk, extendable by HDX


HDU (Ext. Hard Disk Unit):

  • Extend hard disk storage of MCU board 1* SSD/HDD hard disk space
  • 1* VGA video connector 4* USB 2.0
  • Mic and Speaker


SCU (Switch Control Unit)

  • CPU: 1.8GHz, 8 cores RAM: DDR3 512MB
  • Flash: 32MB EMMC: 8GB
  • Network: 2* 10/100/1000Mbps
  • Console: 1* 115200bps, RJ45 USB 2.0: 1

Media Processing

  • Codecs: G.711A/U,G.723.1, G.729AB, iLBC, AMR
  • Silence Suppression
  • Comfort Noise Generator(CNG) Voice Activity Detection(VAD) Echo Cancellation
  • Dynamic Jitter Buffer Programable Gain Value
  • T.38 and Pass-through FAX Modem and POS terminal DTMF: RFC2833/SIP Info/Inband VLAN 802.1p/q
  • Lay3 QoS and DiffServ


  • Connector: RJ11
  • Caller ID: Bellcore Type 1&2, ETSI, BT, NTT and DTMF
  • Answer and Disconnect Signaling:
  • Answer, Disconnect, Busy Tone Polarity Reversal
  • Hook Flash


  • Connector: RJ11 Caller ID: FSK, DTMF
  • Polarity Reversal Answer Delay
  • Busy Tone Detection No Current Detection


FXS/FXO Features

  • Port Group/Hunting Group Digit map
  • Flexible Call Routing Rules Caller/Called Number Manipulation Rules

VoIP Protocol

  • SIP v2.0 (UDP/TCP), RFC3261 SDP, RTP(RFC2833), RFC3262, 3263,3264,3265,3515,2976,3311
  • RTP/RTCP, RFC2198, 1889
  • SIP-T, RFC3372, RFC3204, RFC3398
  • RFC4028 Session Timer SIP TLS
  • RFC2806 TEL URI
  • RFC3581 NAT, rport
  • NAT Traversal: dynamic NAT, STUN




  • Connector: RJ48C
  • 4* Port E1/T1 per board
  • Support ISDN PRI and SS7 signaling ISDN PRI:
  • 23B+D(T1), 30B+D(E1), ITU-T Q.921, ITU-T Q.931, Q.Sig
  • SS7:
  • T1 Frame: 4-Frame Multi- frame (F4,FT),2-Frame Multi-
  • frame (F12, D3/4), Extended Super- frame (F24, ESF) ,Remote Switch Mode (F72, SLC96)
  • Local/Remote Clock Source




  • Static IP
  • DNS, Tracert

DTU Features

  • Local/Remote Ring back tone Overlap Dialing
  • Dial plan up to 2000
  • E1 Group/ Timeslot Group SIP Trunk/SIP Trunk Group Codecs Group Caller/Called Blacklist Caller/Called Whitelist Access Rule List



  • Extensions: 3000
  • Concurrent Calls: 100~300
  • Register Per Second: 100/s
  • Call Per Second: 100/s


  • Web GUI configuration and maintenance Configuration backup and restore
  • PSTN call and release cause statistics SIP call and release cause statistics HTTP firmware upgrade
  • Network capture
  • Syslog: Debug, Info, Error, Warning, Notice
  • Call history record NTP


Call Feature

  • Flexible Route Methods
  • Intelligent Routing Rules Call Routing base on Time
  • Call Routing base on Caller/Called Prefixes
  • 256 Route Rules for each Direction
  • Caller and Called Number Manipulation



  • 1+1 Power Supply, hotplug Input: 100-240VAC, 50-60 Hz
  • Power Consumption:100W Operating Temperature:0 ℃ ~ 45 ℃ Storage Temperature: -20 ℃ ~80 ℃ Humidity:10%-90% Non-Condensing Dimensions(W/D/H): 437*345*66mm Unit Weight: 7.5kg
  • Compliance: CE, FCC