D-Link DVG-6004G GSM VoIP Gateway 

The D-Link DVG-6004G GSM VoIP Gateway is a powerful communication solution designed for businesses seeking to integrate GSM mobile services with their Voice over IP (VoIP) infrastructure. This gateway supports up to four concurrent voice channels, allowing organizations to maximize their communication capabilities while maintaining cost efficiency.

Equipped with four GSM SIM card slots, the DVG-6004G enables seamless connectivity to GSM mobile networks, making it ideal for businesses that rely on mobile services. The device features four FXS ports, allowing for easy connection of analog phones or fax machines, ensuring that existing telephony equipment can be utilized without the need for extensive upgrades.

The gateway operates using the SIP (Session Initiation Protocol), ensuring broad compatibility with various VoIP systems. It supports multiple audio codecs, including G.711, G.729, and G.723.1, providing flexibility in voice quality and bandwidth usage to suit different network conditions.

The DVG-6004G boasts intelligent call routing capabilities, allowing users to implement least-cost routing strategies and failover routing to enhance reliability and reduce communication costs. Additionally, it supports essential telephony features such as call forwarding, call transfer, voicemail, conference calling, and caller ID, empowering businesses to manage their calls efficiently.

Management of the DVG-6004G is user-friendly, featuring a web-based interface for easy configuration and monitoring. The device also supports SNMP (Simple Network Management Protocol), enabling integration into larger network management systems for enhanced oversight.

Security is a priority with the DVG-6004G, as it includes built-in firewall features to protect against unauthorized access. It also supports SIP over TLS for secure signaling, ensuring that sensitive communications remain protected.

With a compact design measuring 250mm x 160mm x 40mm (9.84 x 6.30 x 1.57 inches) and weighing approximately 1.0 kg (2.20 lbs), the gateway is easy to install in various environments. Its operating temperature range of 0°C to 40°C (32°F to 104°F) ensures reliable performance under standard conditions.