Interfaces
- 4 FXS ports
- 1 WAN 10/100Base-T
- 1 USB port
VoIP protocols
- SIP
Voice codecs
- G.711 (a-law, µ-law)
- G.723.1
- G.726 (24 Kbps and 32 Kbps)
- G.729 (a/b)
Fax
- T.38 UDP Real-Time Fax
- G.711 (a-law, µ-law) pass-through
Voice standards
- VAD (Voice Activity Detector)
- CNG (Comfort Noise Generation)
- AEC (Acoustic Echo Cancellation, G.168 recommendation)
Functional features
- Payphones connection (polarity reversal, meter impulses 12/16 KHz)
- Measurement of customer line physical parameters
- Internal switching is saved in case of a SIP-server connection failure
- VAS management via a phone
- Distinctive Ring
- Keep-alive during operation behind NAT
DTMF
- Detection and generation of signals
- Transmission by INBAND, RFC 2833, SIP INFO methods
Value Added services
- Call Hold
- Call Transfer
- Call Waiting
- Calls forwarding when busy
- Calls forwarding on no reply
- Calls forwarding unconditional
- Number identification (FSK Type I, FSK Type II, DTMF)
- Calling Line Identification Restriction (CLIR)
- Hotline/Warmline
- Call Group
- 3-Way Conference
- Pickup Group
- Hunt group
- 3-Way Conference gathered on a server (RFC 4579)
VoIP functions
- Internal connection switching
- Operation without a SIP server
- Flexible dial plan
- 3G/4G reservation
- Management profiles for FXS ports
- SIP profiles (support for up to 8 profiles)
- Geographical redundancy of a SIP server (up to 4 redundant SIP servers)
- Settings appliance without reboot
- Voice transmission through a protected channel (encryption through IPsec)
- IMS (3GPP TS 24.623) for Call Hold, Call Waiting, 3-Way Conference, Hotline management
- SIP server appliance from DHCP option 120
- Support for the operation behind NAT (STUN and Public IP)
- Self call-control signal settings
Quality of service (QoS)
- DSCP and 802.1p assignment for SIP and RTP packets
- Bandwidth redundancy
Network functions
- Different protocols for connection to a service provider network (Static, DHCP, PPPoE, PPTP, L2TP)
- Local DNS server
- Dynamic/static routing
- VLAN per service (VLAN for each service: Internet, VoIP, Management)
- Firewall
- Operation via 3G/4G USB modems
- Print server
- IPsec (for voice transmission and remote control)
Management
- WEB (multilingual*)
- SNMP (phone parameters configuration, monitoring and statistics gathering)
- Telnet
- Syslog
- SSH
- TR-069 (operating through Eltex.ACS server is recommended)
- DHCP-based autoprovision (43, 66, 67 DHCP options)
- Management via IPsec encrypted channel
Security
- Username and password authentication
- Firewall
- Access rights differentiation for admin/user
- Password encryption
- Digest authentication
USB port
- USB-storage connection with FAT/FAT32/EXT2/EXT3/NTFS file systems – files exchange via a network according to FTP protocol
- USB 3G/4G modem connection – 3G/4G channels reservation
- Printer connection – setting up of a print server
Technical characteristics
- CPU Mindspeed
- SDRAM 256 MB
- Flash 32 MB
- OS Linux
Physical characteristics
- Power adapter: 12 VDC, 2A
- Power consumption: up to 11 W
- Temperature: +5°С to +40°С
- Humidity: up to 80%
- Dimensions: 218х120х49 mm, desktop case
- Weight: no more than 0.3 kg
Specifications
- RFC 3261 SIP 2.0
- RFC 3262 SIP PRACK
- RFC 4566 Session Description Protocol (SDP)
- RFC 3263 Locating SIP servers for DNS lookup SRV and A records
- RFC 3264 SDP Offer/Answer Model
- RFC 3311 SIP Update
- RFC 3515 SIP REFER
- RFC 3891 SIP Replaces Header
- RFC 3892 SIP Referred-By Mechanism
- RFC 4028 SIP Session Timer
- RFC 2976 SIP INFO Method
- RFC 2833 RTP Payload for DTMF Digits, Flash event
- RFC 3108 Attributes ecan and silenceSupp in SDP
- RFC 4579 SIP Call Control – Conferencing for User Agents
- RFC 3361 DHCP Option 120
- RFC 3550 RTP A Transport Protocol for Real-Time Applications
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* Supported by firmware version 1.2.1 and higher
