24-Port VoIP Station Gateway


A Comprehensive VoIP Solution
The DVG-2024S VoIP Station Gateway presents an ideal Internet telephone solution for business use. This gateway converts voice traffic into data packets for transmission over the Internet. It combines the industry’s latest Voice over IP (VoIP) network technology with advanced communication features, and is fully compatible with SIP Internet phone services. High port densities allow it to provide a low cost of ownership, convenience, and great savings for companies needing to place frequent long-distance and international business calls.
Cost Saving and Investment Protection
The DVG-2024S gateway provides businesses with an easy and inexpensive upgrade to Internet telephony while allowing them to retain their existing telephone and fax equipment. These devices allow businesses to protect and extend their past investments in telephones, conference speakers phones and fax machines, as well as to control their migration to VoIP with a very affordable and incremental investment.
24 Internet Telephone Connections
This gateway provides 24 FXS ports for simultaneous Internet phone connections. Plug in regular phone sets to these ports and they instantly become Internet telephones. For businesses with a frequent need for long-distance and international phone calls, the VoIP gateway provides great cost savings and convenience while keeping configuration and maintenance to a minimum.
Guaranteed Voice Quality
The DVG-2024S gateway delivers clear voice and reliable phone/fax communication through implementation of internationally recognized standards for voice and data networking. It incorporates Quality of Service (QoS) functions to ensure that audio quality received through the
Internet is the same as or even surpasses that received on a standard land line.
Convenient Call Features
The DVG-2024S gateway supports extensive call features such as call waiting and call forwarding, allowing service providers to offer these functions to all subscribers with compatible telephones. Configuration of an individual phone connection is easy using the multi-language Interactive Voice Response (IVR) system or the web-based user interface.

General features

Voice Features
• G.711 a/μ-law, G.729A/B, G.723.1, G.726ƒ
Packet Interval (ms)
Concurrent Call
G.711 a-law
20 ms, 30 ms, 40 ms
24 ch @ 20 ms
G.711 u-law
20 ms, 30 ms, 40 ms
24 ch @ 20 ms
20 ms, 30 ms, 40 ms
24 ch @ 20 ms
30 ms, 60 ms, 90 ms
24 ch @ 30 ms
20 ms, 30 ms, 40 ms
24 ch @ 20 ms
• DTMF Detection and Generation
• Silence Suppression & Detection
• Comfort Noise Generation (CNG)
• Voice Activity Detection (VAD)
• Echo Cancellation (G.165/G.168)
• Adaptive (Dynamic) Jitter Buffer
• Call Progress Generation
• Auto or Programmable Gain Control
• ITU-T V.152 Voice-band Data over IP Networks
SIP Call Features
• Peer to PeerCall
• Call Hold / Retrieve
• Call Waiting
• Call Pick Up
ƒ- Call Park / Retrieve (SIP Server Required)
ƒ- Call Forward - unconditional, busy, no answer
ƒ- Call Transfer - attended, unattended
• Do Not Disturb
• Speed Dialing
• Repeat Dialing
• Three-wayCalling
• MWI (RFC-3842)
• Hot Line and Warm Line
Telephony Specifications
• In-Band DTMF, Out-of-Band DTMF Relay (RFC2833 or SIP INFO)
• DTMF / PULSE Dial Support
• Caller ID Generation / Detection:
- FSK-Bellcore Type 1 & 2
- FSK-ETSI Type 1 & 2
- FSK:Calling Name, Number, Date and Time, VMWI
• FXS Metering Pulse:
- Polarity Reversal
- 12kHzCalling tone
- 16kHzCalling tone
• T.30 FAX Bypass to G.711, T.38 Real Time FAX Relay
• FXS Line test and diagnostics with visual alarm indication
- Inward self test:
- Loopback –Codec
- Loopback – analogue
- SLIC DC power voltage
- Tip / Ring DC feed
- Ringer
- Outward Test (GR909 Standard) :
- Phone Line disconnected
- H.F. DC Voltage (Hazardous and foreign DC Voltage)
- H.F. AC Voltage (Hazardous and foreign AC Voltage)
- Tip / Ring Short
• Modem over IP up to V.34
• ROH Tone (Receiver Off-Hook Tone @ 480 Hz)
• Loop Current Suppression
SIP Account Management
• By Port Registration
• By Device Registration (share account)
• Mixed Mode (Hunt number for inbound, by port number for outbound)
• Invite with Challenge
• Register by SIP Server IP Address or Domain Name
• Support RFC3986 SIP URI Format
SIP Call Management
• Support Outbound Proxy
• Register up to three SIP servers
• SIP Registration Failover Mechanism
• Group Hunting
• Privacy Mechanism / Private Extensions to SIP
• Session Timers (Update / Re-invite)
• DNS SRV Support
• Call Types: Voice / Modem / FAX
• Call Routing by Prefix Number
• User Programmable Dial Plan Support
• CDR Client
• Manual Peer Table (for P2P calls)
• E.164 Numbering, ENUM support
IP Network Specifications
• Support IPv4, IPv6 future upgradable (Option)
• Network Protocol Support: IP, TCP, UDP, TFTP, FTP, RTP, RTCP, ARP, RARP, ICMP, NTP, SNTP, SNMP v1/v2,HTTP, HTTPS, DNS, DNS SRV, Telnet, DHCP Server, DHCP Client, STUN Client, UPnP
• QoS Support:
- WAN: DiffServ, IP Precedence, Priority Queue, Rate Control, 802.1Q (VLAN Tagging), 802.1p (Priority Tag)
• DDNS Support
Network Security Specifications
• VPN PPTP Client
• DIGEST Authentication
• MD5 Encryption
• DoS Protection
• Web-Based Configuration
• Auto-provisioning (HTTP / HTTPS)
• Telnet
• FTP / TFTP / HTTP Software Upgrade
• Configuration Backup and Restore
• Reset to Default Button
• TR-069/104 (Option)
SIP, Voice and FAX Related Standard
• RFC1889 RTP: A Transport Protocol for Real-Time Applications.
• RFC2543 SIP: Session Initiation Protocol
• RFC2833 RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
• RFC2880 Internet Fax T.30 Feature Mapping
• RFC2976 The SIP INFO Method
• RFC3261 SIP: Session Initiation Protocol
• RFC3262 Reliability of Provisional Responses in Session Initiation Protocol (SIP)
• RFC3263 Session Initiation Protocol (SIP): Locating SIP Servers
• RFC3264 An Offer/Answer Model with Session Description Protocol (SDP)
• RFC3265 Session Initiation Protocol (SIP) - Specific Event Notification
• RFC3311 The Session Initiation Protocol (SIP) UPDATE Method
• RFC3323 A Privacy Mechanism for the Session Initiation Protocol (SIP)
• RFC3325 Private Extensions to the Session Initiation Protocol (SIP) for Asserted
• Identity within Trusted Networks
• RFC3362 Real-time Facsimile (T.38) - Image/t38 MIME Sub-type Registration
• RFC3515 The Session Initiation Protocol (SIP) Refer Method
• RFC3550 RTP: A Transport Protocol for Real-Time Applications. July 2003
• RFC3665 Session Initiation Protocol (SIP) Basic Call Flow Examples
• RFC3824 Using E.164 numbers with the Session Initiation Protocol (SIP)
• RFC3841 Caller Preferences for the Session Initiation Protocol (SIP)
• RFC3842 A Message Summary and Message Waiting Indication Event Package for the
• Session Initiation Protocol (SIP)
• RFC3891 The Session Initiation Protocol (SIP) “Replaces” Header
• RFC3892 The Session Initiation Protocol (SIP) Referred-By Mechanism
• RFC3960 Early Media and Ringing Tone Generation in the Session Initiation Protocol (SIP)
• RFC3986 Uniform Resource Identifier (URI): Generic Syntax
• RFC4028 Session Timers in the Session Initiation Protocol (SIP)
• Draft-ietf-sipping-service-examples-08 for call features
Network Related Standards
• RFC318 Telnet Protocols
• RFC791 Internet Protocol
• RFC792 Internet Control Message Protocol (ICMP)
• RFC793 Transmission Control Protocol (TCP)
• RFC768 User Datagram Protocol (UDP)
• RFC826 Ethernet Address Resolution Protocol (ARP)
• RFC959 File Transfer Protocol (FTP)
• RFC1034 Domain Names - concepts and facilities
• RFC1035 Domain Names - implementation and specification
• RFC1058 Routing Information Protocol (RIP)
• RFC1157 Simple Network Management Protocol (SNMP)
• RFC1305 Network Time Protocol (NTP)
• RFC1321 The MD5 Message-Digest Algorithm
• RFC1349 Type of Service in the Internet Protocol Suite
• RFC1350 TFTP Protocol (Revision 2)
• RFC1661 Point-to-Point Protocol (PPP)
• RFC1738 Uniform Resource Locators (URL)
• RFC2854 The ‘text/html’ Media Type
• RFC2131 Dynamic Host Configuration Protocol (DHCP)
• RFC2136 Dynamic Updates in the Domain Name System (DNS UPDATE)
• RFC2327 SDP: Session Description Protocol
• RFC2474 Definition of the Differentiated Services Field (DS Field)
• RFC2516 A Method for Transmitting PPP Over Ethernet
• RFC2616 Hypertext Transfer Protocol - HTTP/1.1
• RFC2617 HTTP Authentication: Basic and Digest Access Authentication
• RFC2637 Point-to-Point Tunneling Protocol
• RFC2766 Network Address Translation - Protocol Translation (NAT-PT)
• RFC2782 A DNS RR for Specifying the location of Services (DNS SRV)
• RFC2916 E.164 Number and DNS
• RFC3022 Traditional IP Network Address Translator
• RFC3489 STUN - Simple Traversal of User Datagram Protocol (UDP) through Network
• Address Translators (NATs)
Power Input
• 100 to 240 V AC
• Power consumption: 70 W
• MTBF: 78864 hrs
• 445 x 240 x 45 mm (17.5 x 9.4 x 1.8 inches)
• 19-inch standard rack-mount width, 1U height
• 3.4 kg (7.5 lb)
Operating Temperature
• 0° to 40° C (32° to 104° F)
Storage Temperature
• -20° to 60° C (-4° to 140° F)
• Up to 95% non-condensing
• FCC Class A
• CE


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DVG-2024S 24-Port VoIP Station Gateway


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