Key benefits
  • IP PBX for up to 500 subscribers
  • Up to 100 simultaneous calls
  • Up to 4 E1 flows (RJ-48)
  • 4 LAN ports
  • Call center functionality
  • Call recording

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Physical parameters


The enterprise IP PBX SMG-500 connects up to 250 SIP subscribers in basic configuration and can be extended to 500 SIP subscribers when acquiring an appropriate lisence1.
The E1 ports and SIP trunks can be used for PSTN connection. Analogue phones are connected to SMG-500 via subscriber VoIP gateways, IP phones - directly through the company network. Call records and CDR files are stored on SD card or USB flash drive. It is also possible to upload files to external media and to FTP server automatically.


  • 4 Е1 (RJ-48) ports
  • 4 ports of Ethernet 10/100/1000Base-T (RJ-45)
  • 1 port of USB2.0, 1 port of USB3.0
  • 1 slot for SD card (SDHC)
  • 1 COM port (RS-232, RJ-45)

VoIP protocols
  • H.323

Advanced SIP/SIP-T/SIP-I features
  • SIP and SIP-T/SIP-I interaction

TDM protocols
  • SS7
  • PRI (Q.931)
  • Q.699 (PRI and SS7 interaction)

Voice codecs
  • G.711 (a-law, μ-law)
  • G.726
  • G.729 (A/B)
  • OPUS*
  • AMR*

Voice standards
  • VAD (Voice Activity Detection)
  • CNG (Comfort Noise Generation)
  • AEC (echo cancellation, G.168 recommendation)

  • Interactive voice response system (IVR) with graphic editor
  • DISA - Direct Inward System Access

Call queue:

  • Various algorithms for operators selection
  • Call distribution considering repeated calls from clients
  • Reporting system for operators/groups of operators (processed calls, missed calls, average waiting time etc.)

Phone book:

  • Creating a phone book from station subscribers list
  • Transferring a phone book to subscribers via LDAP
  • Obtaining a display name from LDAP server

Video processing:

  • Video transmission in the Video Offroad mode

Call management
  • Number modifications before and after routing
  • Call recording according to parameters
  • Routing by access category
  • Subscriber lines restriction
  • Subscriber service mode configuration
  • Trunk group cut-off
  • Direct connection of trunk groups
  • Prefix for multiple trunk groups
  • Limiting the number of simultaneous calls to the SIP interface
  • Ingress load limiting (call per second) for a trunk group
  • Interaction with the STUN server on a SIP server
  • Routing by Called Party Number (CdPN) and/or Calling
  • Party Number (CgPN)

Quality of Service (QoS)
  • Diffserv assignment for SIP
  • Diffserv assignment for RTP*

  • Transmission via INBAND, RFC 2833, SIP INFO, SIP NOTIFY

Supplementary Services

Call Forwarding:

  • Call forwarding on out of service (CFOS)
  • Call forwarding on no reply (CFNR)
  • Call forwarding unconditional (CFU)
  • Call forwarding on busy (CFB)
  • Call forwarding on time (CFT)
  • Call Transfer
  • Music on Hold (MOH)
  • Call Hold
  • SIP-forking support for SIP subscribers
  • Call Hunt
  • Call Pickup
  • Call Parking
  • Busy Lamp Field
  • Add-on conference (CONF)
  • Conference based on subscribers list
  • 3-Way conference
  • Intercom
  • Paging Call
  • Call Queue
  • Сall Back when the position in queue is reached
  • Call Recording
  • PINCodeAccess
  • Follow me
  • Follow me on No Response
  • Do not disturb (DND) with whitelist
  • Blacklist
  • Intervention
  • Voice mail
  • One Touch Record

  • Uploading/Downloading configuration as a single file
  • Creating multiple network for telephony (SIP, RTP) with different IP addresses
  • Operation with multiple dial plans
  • SS7 signal channel redundancy
  • Voice activity control (by the presence of RTP or RTCP)*

  • Black and white IP addresses lists for registration
  • Logging of attempts to access the device
  • Automatic blocking by IP address after unsuccessful login attempts or/and access via http/https/telnet/ssh
  • List of permitted IP addresses for access to control the device
  • Multilevel access permission
  • SIP subscribers authentication
  • RADIUS authentication (RFC 5090, Draft-Sterman)

  • Billing data is recorded to CDR file. Simultaneously, CDR file is recorded to a local SD disk, USB storage device or remote FTP server
  • RADIUS Accounting
Supported billing systems:
  • Hydra Billing
  • LANBilling
  • PortaBilling
  • NetUP
  • BGBilling
  • Integration with other systems is possible

Management and monitoring
  • E1 and VoIP flow channels monitoring via web interface
  • Channels and SS7 signal links management via web interface
  • Alarm logging with the option of storing entries on the syslog server
  • Storing traces on SD card/USB storage device
  • Alarm reporting via SNMP
  • Automatic logging activation after gateway restart
  • Monitoring of active sessions of the web interface users
*Not supported in the current firmware version

Documents and files


Regardless of the operational lifetime stage, Eltex provides a 12 months warranty on all its telecommunication equipment.

During the warranty period the manufacturer ensures technical support and free-of-charge repair at the Enterprise which is situated in Novosibirsk.

As part of the warranty service, technical support is provided on the first-in first-out principle.

The priority support packages of 8/5 and 27/7 types are subjects to additional charges.

Physical parameters

Operating temperature
  • from 0 to +40 °С
Relative humidity
  • up to 80 %
Power supply
Power consumption
  • up to 40 W during battery charge, up to 20 W without battery charge
Dimensions (W×H×D)
  • 430 × 44 × 203 mm
  • 19", 1U
  • 2.35 kg