VOS3000 SIP Trunk Configuration Guide – Connect Best Carriers & Gateways
The VOS3000 softswitch is widely used by wholesale VoIP operators to manage carrier routing, SIP trunk connections and international telecom traffic. One of the most important tasks in any VOS3000 deployment is configuring SIP trunks that connect the system to telecom carriers or VoIP gateways.
This guide explains the fundamentals of VOS3000 SIP trunk configuration, how carriers connect to the system and how gateways are used for routing outbound VoIP calls.
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Table of Contents
What is a SIP Trunk in VOS3000?
A SIP trunk is a connection between the VOS3000 softswitch and an external VoIP provider, carrier or gateway. It allows the system to send and receive calls using the SIP protocol.
Wholesale VoIP operators typically configure multiple SIP trunks so that calls can be routed through different termination providers.
This setup helps operators:
- Connect multiple telecom carriers
- Route international calls
- balance traffic between providers
- implement failover routing
- optimize termination cost
How VOS3000 Uses SIP Trunks
In a typical telecom deployment, SIP trunks connect the softswitch to external networks.
The basic call flow works like this:
- A call enters the VOS3000 system
- The system checks routing rules and destination prefix
- VOS3000 selects a carrier route
- The call is sent to the carrier using a configured SIP trunk
- The carrier completes the call to the destination network
This process allows operators to manage call routing across multiple providers efficiently.
Types of Carrier Connections
VOS3000 supports different types of carrier connections depending on the telecom provider.
Common connection methods include:
- SIP trunk authentication
- IP based SIP trunk
- gateway connection
- direct SIP peer connection
Most wholesale VoIP providers use IP authentication where the carrier allows connections only from specific server IP addresses.
Adding a Carrier Gateway in VOS3000
To configure routing to a telecom provider, operators first create a gateway entry in the VOS3000 system.
The gateway defines how the system communicates with the external carrier.
Typical gateway parameters include:
- Gateway name
- Carrier IP address
- SIP port
- transport protocol
- codec configuration
After a gateway is created, it can be used in routing tables.
Routing Calls Through SIP Trunks – VOS3000 SIP Trunk
Once a gateway is configured, routing rules determine when the system should use that carrier.
Routing decisions are based on:
- destination prefix
- vendor priority
- least cost routing
- traffic balancing
For example:
- US calls → Carrier A
- UK calls → Carrier B
- Asia routes → Carrier C
These routing policies allow telecom operators to manage global call traffic efficiently.
Failover Routing Between Carriers
One important feature of VOS3000 is automatic failover routing.
If a carrier fails or rejects calls, the system automatically attempts the next configured route.
This improves call completion rates and prevents service disruption.
Failover routing is widely used in wholesale VoIP networks where reliability is critical.
Monitoring SIP Trunk Performance
After trunks are configured, operators monitor traffic using VOS3000 statistics and reporting tools.
Important performance metrics include:
- CPS (calls per second)
- ASR (answer seizure ratio)
- ACD (average call duration)
- call completion rate
Monitoring these metrics helps operators optimize routing and maintain call quality.
Useful VOS3000 Resources – VOS3000 SIP Trunk
VOS3000 Client Download Center
Official VOS3000 Manuals & Downloads
FAQ – VOS3000 SIP Trunk Configuration
What is a SIP trunk in VOS3000?
A SIP trunk connects the VOS3000 softswitch to an external VoIP carrier or gateway for call routing.
Can VOS3000 connect multiple carriers?
Yes. Multiple gateways and SIP trunks can be configured to connect different telecom providers.
Does VOS3000 support failover routing?
Yes. If the primary route fails, VOS3000 automatically switches to the next available carrier.
Where can I download VOS3000 client software?
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