VOS3000 Softswitch FAQ – Complete Technical Guide Based on Official Manual

This article provides a comprehensive list of frequently asked questions (FAQs) strictly based on the official VOS3000 Soft switch PDF Manual (V2.1.9.07). All explanations reflect real system behavior, configuration options, and operational logic described in the documentation, including routing, billing, SIP signaling, CDR handling, alarms, and system parameters.

1. What is VOS3000 Soft switch?

VOS3000 is a carrier-grade VoIP soft switch platform designed for telecom operators and VoIP service providers. It integrates call control, routing management, billing, account management, SIP signaling, and CDR processing into a unified system.

2. Which operating system is required for VOS3000?

According to the manual, VOS3000 is deployed on Linux server environments. Stable Linux distributions are recommended to ensure performance, reliability, and compatibility with system services.

3. What protocols are supported by VOS3000?

VOS3000 supports SIP and H.323 signaling protocols. These protocols are used for call setup, termination, authentication, and interoperability with gateways, carriers, and SIP devices.

4. How does call routing work in VOS3000?

Call routing in VOS3000 is prefix-based. The system compares destination number prefixes with routing rules, gateway priorities, rate tables, and availability to determine the most suitable route.

5. Does VOS3000 support Least Cost Routing (LCR)?

Yes. VOS3000 includes Least Cost Routing functionality that selects routes based on the lowest rate per second, while also considering gateway priority and routing quality.

6. What is a routing gateway in VOS3000?

A routing gateway represents an outbound route toward a vendor or carrier. It includes IP address, protocol settings, line limits, billing account association, and routing priority.

7. What is a mapping gateway?

A mapping gateway represents inbound traffic sources. It maps incoming calls from a specific IP or device to an account and applies authentication, billing, and routing rules.

8. What is a gateway group?

Gateway groups are used to combine multiple routing and mapping gateways into a single logical group, allowing capacity control, routing restrictions, and simplified management.

9. Can VOS3000 limit concurrent calls?

Yes. VOS3000 allows administrators to set line limits at gateway, gateway group, and account levels to restrict the number of concurrent calls.

10. How does VOS3000 handle call failover?

If a routing gateway fails or becomes unavailable, VOS3000 automatically attempts the next available route based on priority and routing rules.

11. How does VOS3000 generate Call Detail Records (CDR)?

VOS3000 generates a CDR for each call attempt. The record includes caller number, callee number, start time, end time, duration, gateway IDs, billing mode, and termination reason.

12. Where are CDR files stored?

When enabled, CDRs are written to text files in the CDR directory under the VOS3000 installation path. Files are generated hourly using a timestamp-based naming format.

13. Does VOS3000 support real-time billing?

Yes. VOS3000 performs real-time billing by deducting call charges from account balances during the call. Calls are terminated automatically if balance limits are exceeded.

14. What billing modes are supported?

Billing can be performed by phone number, gateway ID, or phone card, depending on account configuration and call source.

15. What is an account in VOS3000?

An account represents a customer or vendor entity. It controls balance, billing rules, routing permissions, credit limits, and authentication parameters.

16. What is an agent account?

Agent accounts can have sub-accounts. Charges incurred by sub-accounts are aggregated to the agent account, allowing hierarchical billing structures.

17. How are rate tables used?

Rate tables define call pricing based on destination prefixes. They are assigned to accounts and routing gateways to calculate call charges.

18. Can VOS3000 block specific destinations?

Yes. Forbidden prefixes can be configured to block calls to specific destinations, such as premium or high-risk numbers.

19. Does VOS3000 support number translation?

VOS3000 supports number transformation rules that allow adding, removing, or replacing digits before routing or billing.

20. How does VOS3000 authenticate calls?

Authentication can be performed using SIP credentials or IP-based authentication, depending on the gateway and account configuration.

21. Does VOS3000 support SIP OPTIONS monitoring?

Yes. SIP OPTIONS messages can be sent periodically to detect gateway availability. If a gateway fails OPTIONS checks, it is temporarily excluded from routing.

22. What codecs are supported?

VOS3000 supports common VoIP codecs such as G.711 and G.729, configurable at gateway and protocol levels.

23. How does VOS3000 handle NAT?

NAT traversal features include keep-alive messages, SDP address handling, and media proxy settings to ensure stable SIP communication.

24. What is call duration precision?

The system allows configuration of billing time precision, determining how call duration is rounded for billing purposes.

25. Can VOS3000 restrict calls by time?

Yes. Work calendars and time-based rules allow administrators to restrict calls during specific hours or non-working periods.

26. What alarm features are available?

VOS3000 includes alarm monitoring for gateway status, balance thresholds, system errors, and abnormal traffic conditions.

27. How are logs managed?

System logs and history alarm tables are stored in the database and can be accessed through the data maintenance interface.

28. Can VOS3000 prevent overdraft?

Anti-overdraft mechanisms prevent accounts from exceeding allowed balances by checking credit availability before and during calls.

29. What is bilateral reconciliation?

Bilateral reconciliation compares billing amounts between customers and vendors to detect deviations automatically.

30. Does VOS3000 support LRN lookup?

Yes. For number portability, VOS3000 supports LRN queries to external servers and can route calls based on returned LRN numbers.

31. Can VOS3000 forward call status via HTTP?

HTTP call status notifications can be enabled to send call events to external systems for integration purposes.

32. What is rate limiting in VOS3000?

Rate limiting restricts the number of call attempts within a defined period to protect the system from abuse or attacks.

33. Does VOS3000 support SIP header manipulation?

Yes. SIP headers such as P-Asserted-Identity and P-Preferred-Identity can be passed through, modified, or replaced based on configuration.

34. How does VOS3000 handle call failures?

Call failure causes are recorded in CDRs and categorized by server-side, SIP device, or network-related termination reasons.

35. What is a package in VOS3000 billing?

Packages define free duration, free money amount, rent period, and minimum consumption rules applied before standard billing.

36. How are packages prioritized?

Package priority determines which package takes effect first when multiple packages are assigned to an account.

37. Does VOS3000 support payment and recharge?

Yes. Payments can be applied manually or via phone cards, affecting account balance and expiration.

38. Can VOS3000 generate billing reports?

Billing reports include account balance, gateway bills, phone bills, area details, and statistical summaries.

39. What is the operation wizard?

The operation wizard provides guided steps to quickly configure common scenarios such as gateway-to-gateway or phone-to-routing setups.

40. Can VOS3000 manage multiple IP addresses per gateway?

Yes. Multiple IPs and ports can be configured per gateway, with automatic selection based on availability.

41. What is SIP authentication retry?

SIP authentication retry defines how many times the system retries authentication when receiving unauthorized responses.

42. Does VOS3000 support voicemail?

Voicemail features include configurable storage duration, maximum message count, and default welcome prompts.

43. What is call PDD in VOS3000?

Post Dial Delay (PDD) measures the time from call initiation to call connection and is recorded in CDRs.

44. Can VOS3000 suppress zero-duration CDRs?

Yes. The system can be configured to ignore CDRs with zero hold time to reduce unnecessary records.

45. Does VOS3000 support multi-currency billing?

Billing precision and monetary units can be configured to support different currency formats.

46. What is signaling tracing?

Signaling tracing allows administrators to trace call setup, registration, and termination messages for troubleshooting.

47. Can VOS3000 handle high call volumes?

VOS3000 is designed for carrier environments and can handle high concurrent call volumes when deployed on appropriate hardware.

48. Does VOS3000 support system backups?

Database backup and maintenance functions help protect configuration, billing, and call data.

49. How is system performance monitored?

Performance monitoring includes gateway status, call statistics, alarm monitoring, and traffic analysis.

50. Who should use VOS3000 Soft switch?

VOS3000 is suitable for VoIP carriers, telecom operators, wholesalers, and enterprises requiring advanced call routing and billing control.

Full manual download link : https://vos3000.com/downloads/VOS3000_21907_Manual_Original_English_Full_VOS3000.Com_PDF.pdf

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Thanks

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