The IAD-4O is a multi-channel high-access IP-based gateway, offering a cost-effective and easy-to-use IP voice telephony solution for small businesses, home offices, remote branches, and multi-branch enterprises. It supports 4 FXO voice interfaces for connecting traditional telecom operator telephone lines or analog PBX systems. The VoIP access gateway adopts the standard SIP protocol, ensuring compatibility with most IP-PBX, softswitch, and SIP-based network platforms.

Cost- Effective VolP Gateway

• 4 FXO ports, 1 WAN, 2 LAN
• Support SIP, MS
• T.38 Fax
• Flexible routing & Dial plan
• Interoperable with leading softswitches, IP-PBXsand SlP servers

High Stability and  Reliability

• Embedded Operation System
• Market-proven hardware design
• Carrier-grade reliability
• Main/Secondary Slp server failover
• TLS/SRTP Security

Easy Management

• Intuitive Web interface including Quickinstallation guide
• Support SNMP &TR-069
• Automated provisioning
• Dinstar Cloud Management System
• Configuration Backup and Restore
• Debug tools in web interface

G.711A/U law, G.723.1, G.729A/B
Comfort Noise Generation (CNG)
Voice Activity Detection (VAD)
Echo Cancellation (G.168)
Adaptive Dynamic Jitter Buffer
DTMF Detection
Voice and Fax Gain Control
T.38/Pass-through
DTMF Modes: Signal/RFC2833/INBAND
Busy Tone Detection
Off-hook Current Disconnection Detection
Voice Interruption Detection
One-shot Dialing
Two-stage Dialing
PSTN Trunk Port Polling
Support for Polarity Reversal Signal
FAS (False Accounting Suppression)
AC/DC Impedance Configuration
Call Detection (Bellcore Type 1&2, ETSI, DTMF)

1. Professional voice processing chip with high-performance and full-concurrent call processing capabilities
2. Supports 4 FXO voice interfaces
3. Supports codecs: G.711, G.729, G.723, G.726, iLBC, AMR, etc.
4. Supports voice, fax, and POS terminal connections
5. Network interfaces: 1* LAN, 1* WAN, 10/100Mbps, RJ45