How do you configure a Dinstar UC120 for SIP trunk integration with an IP-PBX?

[dinstar]

The Dinstar UC120 GSM Gateway requires specific configuration steps to successfully integrate with an IP-PBX system via SIP trunk. Here's a detailed configuration guide:

1. Initial Access Setup:
   • Connect to the UC120 via Ethernet cable
     
   • Access the web configuration interface by entering the default IP address (typically 192.168.11.1) in your browser
     
   • Login with default credentials (admin/admin)
     
2. Network Configuration:
   • Navigate to "Network → Basic"
     
   • Configure a static IP address compatible with your network environment
     
   • Set appropriate subnet mask and default gateway
     
   • Apply changes and reconnect using the new IP if necessary
     
3. SIP Settings:
   • Go to "SIP → Basic"
     
   • Configure the SIP port (default 5060)
     
   • Set your SIP domain or IP-PBX IP address
     
   • Configure registration parameters including authentication credentials if required by your PBX
     
   • Set proper RTP port range (typically 10000-20000)
     
4. GSM Module Configuration:
   • Navigate to "GSM → Basic"
     
   • Ensure SIM cards are properly detected
     
   • Configure PIN settings if needed
     
   • Set DTMF mode (RFC2833 recommended for most IP-PBX systems)
     
5. Route Configuration:
   • Go to "Route → Basic"
     
   • Configure inbound routes to direct incoming GSM calls to your IP-PBX
     • Set the destination IP address of your PBX
       
     • Configure DID routing if needed
       
   • Configure outbound routes for calls from PBX to GSM
     • Set prefix matching rules
       
     • Define call routing priorities
       
6. Call Control Settings:
   • Set maximum call duration if required
     
   • Configure caller ID settings
     
   • Set up failover routing options
     
7. Testing the Configuration:
   • Make test calls in both directions
     
   • Verify audio quality
     
   • Check call detail records
     

The most common issue during integration is mismatched SIP parameters between the UC120 and the PBX. If calls fail to connect, verify that both systems are using compatible codec settings (G.711 is recommended for initial testing), and that NAT traversal is properly configured if the systems are on different networks.