VOS3000 LRN Server Configuration Reliable SS_LRN_SERVER_IP PORT Setup

Setting up VOS3000 LRN server configuration with SS_LRN_SERVER_IP and SS_LRN_SERVER_PORT is the foundational step for enabling number portability lookups in your VOS3000 softswitch. These two parameters define the IP address and TCP/UDP port of the external LRN (Local Routing Number) dip server that VOS3000 queries before routing US termination calls. Without a properly configured LRN server connection, your VOS3000 system cannot perform number portability lookups, and all US calls will route based on the dialed number’s original rate center rather than the actual serving carrier. Need assistance? Contact us on WhatsApp: +8801911119966.

The LRN dip server is an external service — typically provided by a specialized NPAC (Number Portability Administration Center) query aggregator — that receives a dialed number query and returns the Local Routing Number identifying the current serving carrier. VOS3000 acts as an LRN client, sending queries to this server and processing the responses to make routing and billing decisions. The SS_LRN_SERVER_IP and SS_LRN_SERVER_PORT parameters, documented in §4.3.5.2 of the softswitch parameters manual, define where VOS3000 sends these queries.

Table of ContentsVOS3000 LRN Server Configuration Reliable SS_LRN_SERVER_IP PORT SetupVOS3000 LRN Server Configuration Parameter ReferenceWhy an External LRN Server Is RequiredStep-by-Step VOS3000 LRN Server ConfigurationHow VOS3000 Sends and Processes LRN LookupsLRN Server Connectivity Requirements (VOS3000 LRN Server Configuration)Troubleshooting LRN Server Connection IssuesRelated Resources – VOS3000 LRN Server ConfigurationFrequently Asked Questions About VOS3000 LRN Server ConfigurationWhat is SS_LRN_SERVER_IP in VOS3000?What port should I use for SS_LRN_SERVER_PORT?Do I need to restart VOS3000 after changing LRN server settings?Can VOS3000 connect to multiple LRN servers for redundancy?How do I verify the LRN server connection is working?What protocol does VOS3000 use for LRN queries?Get Professional VOS3000 LRN Server Setup Need Professional VOS3000 Setup Support?

VOS3000 LRN Server Configuration Parameter Reference

The two primary parameters for VOS3000 LRN server configuration are defined in the softswitch configuration file. These are global parameters that apply to all mapping gateways using Internal LRN query mode.

ParameterDescriptionDefault / RangeSS_LRN_SERVER_IPIP address of the external LRN dip serverEmpty (must be configured)SS_LRN_SERVER_PORTTCP/UDP port of the LRN dip serverEmpty (must be configured)Configuration FileSoftswitch parameters (mbx2008.conf)/etc/vos3000/mbx2008.confManual SectionVOS3000 softswitch parameters reference§4.3.5.2ScopeGlobal (applies to all gateways using Internal LRN)System-wide

Why an External LRN Server Is Required

VOS3000 does not include a built-in LRN database. The NPAC databases that store number portability records are managed by third-party administrators (such as Neustar/Iconectiv in the US) and are accessed through dedicated LRN query services. VOS3000 must connect to an external LRN dip server that has subscriptions to these NPAC databases. The LRN server receives the dialed number query, performs the NPAC lookup on behalf of VOS3000, and returns the LRN result. This architecture separates the softswitch routing logic from the number portability data management.

ComponentRoleManaged ByVOS3000 SoftswitchSends LRN query, processes response, routes callVoIP OperatorLRN Dip ServerReceives query, looks up NPAC, returns LRNLRN Service ProviderNPAC DatabaseMaster number portability recordsIconectiv / NeustarServing Carrier SwitchTerminates the call to the subscriberTermination Carrier

Step-by-Step VOS3000 LRN Server Configuration

Follow these steps to configure SS_LRN_SERVER_IP and SS_LRN_SERVER_PORT in your VOS3000 system. Before starting, obtain the LRN server IP address and port number from your LRN service provider. For configuration help, message us on WhatsApp: +8801911119966.

StepActionCommand or Detail1Backup configurationcp /etc/vos3000/mbx2008.conf /etc/vos3000/mbx2008.conf.bak2Open configuration filevi /etc/vos3000/mbx2008.conf3Set LRN server IPSS_LRN_SERVER_IP=203.0.113.504Set LRN server portSS_LRN_SERVER_PORT=84435Save and close:wq in vi6Restart softswitch serviceservice vos3000 restart7Test LRN connectivityPlace test call to ported number, check CDR for LRN field

How VOS3000 Sends and Processes LRN Lookups

When a call arrives at a mapping gateway with Internal LRN query mode enabled, VOS3000 initiates an LRN lookup to the configured server. The softswitch sends a query containing the dialed number to the SS_LRN_SERVER_IP on the SS_LRN_SERVER_PORT. The LRN server processes the query against the NPAC database and returns the LRN for that number. VOS3000 then uses the returned LRN for prefix matching in the rate table and for gateway routing decisions. The entire LRN dip typically adds 20-100 milliseconds to call setup time depending on network latency to the LRN server. For understanding the broader call flow, see our VOS3000 SIP call flow guide.

Lookup PhaseActionTypical DurationQuery SendVOS3000 sends dialed number to LRN server1-5 ms (local) / 10-30 ms (remote)Server ProcessingLRN server queries NPAC database5-50 msResponse ReceiveVOS3000 receives LRN response1-5 ms (local) / 10-30 ms (remote)Routing DecisionVOS3000 uses LRN for rate/gateway lookup1-5 ms

LRN Server Connectivity Requirements (VOS3000 LRN Server Configuration)

For VOS3000 LRN server configuration to work reliably, the VOS3000 softswitch server must have network connectivity to the LRN dip server on the specified IP and port. Firewall rules must allow outbound connections from the VOS3000 server to SS_LRN_SERVER_IP on SS_LRN_SERVER_PORT. The LRN service provider will typically specify whether the connection uses TCP or UDP and whether TLS encryption is required. Network latency between VOS3000 and the LRN server should be minimized to avoid adding excessive delay to call setup.

RequirementSpecificationNotesNetwork AccessOutbound TCP/UDP to LRN serverFirewall must allow specified portLatencyUnder 50ms round-trip recommendedHigher latency increases PDDTLS SupportDepends on LRN providerSome providers require encrypted connectionsService Availability99.99% uptime SLA recommendedLRN downtime impacts all US calls

Troubleshooting LRN Server Connection Issues

When VOS3000 LRN server configuration problems occur, the most common symptom is that LRN lookups fail or timeout, causing calls to fall back to dialed-number routing. For deeper troubleshooting, check our CDR billing discrepancy guide and call termination reasons reference.

ProblemLikely CauseSolutionConnection refusedWrong IP or port in SS_LRN_SERVER_IP/PORTVerify IP and port with LRN providerConnection timeoutFirewall blocking or network issueCheck firewall rules, test with telnetLRN queries return emptyLRN server subscription issueContact LRN service providerHigh PDD after LRN enableHigh latency to LRN serverUse closer LRN server or reduce timeoutConfig not taking effectService not restarted after changeRestart vos3000 service

Related Resources – VOS3000 LRN Server Configuration

VOS3000 SIP Call Flow Guide

VOS3000 Call Termination Reasons

VOS3000 CDR Billing Discrepancy

RFC 3482 – Number Portability Framework

Frequently Asked Questions About VOS3000 LRN Server Configuration

What is SS_LRN_SERVER_IP in VOS3000?

SS_LRN_SERVER_IP is a VOS3000 softswitch parameter that specifies the IP address of the external LRN (Local Routing Number) dip server. When a mapping gateway is configured for Internal LRN query mode, VOS3000 uses this IP address to connect to the LRN server and send number portability queries. This parameter is defined in the softswitch configuration file (mbx2008.conf) under section §4.3.5.2 of the VOS3000 manual. It must be set to the IP address provided by your LRN service provider.

What port should I use for SS_LRN_SERVER_PORT?

The port number for SS_LRN_SERVER_PORT depends on your LRN service provider’s configuration. Common ports include 8443 for HTTPS-based LRN queries, 5060 for SIP-based queries, or custom ports specified by the provider. You should use the exact port number provided by your LRN service provider. Never guess or use default ports without confirming with the provider, as incorrect port configuration will cause all LRN queries to fail.

Do I need to restart VOS3000 after changing LRN server settings?

Yes, changes to SS_LRN_SERVER_IP and SS_LRN_SERVER_PORT require a restart of the VOS3000 softswitch service to take effect. These parameters are read during softswitch initialization and are not reloaded dynamically. Use the command service vos3000 restart after making changes to the configuration file. Always schedule restarts during low-traffic periods to minimize call disruption.

Can VOS3000 connect to multiple LRN servers for redundancy?

The standard SS_LRN_SERVER_IP parameter supports a single LRN server endpoint. For high-availability deployments, operators typically configure a load balancer or DNS round-robin in front of multiple LRN server instances, and point SS_LRN_SERVER_IP to the virtual IP of the load balancer. This provides redundancy at the infrastructure level without requiring VOS3000 to manage multiple LRN connections directly. Some advanced LRN service providers offer their own failover endpoints.

How do I verify the LRN server connection is working?

To verify the LRN server connection, first test network connectivity using telnet SS_LRN_SERVER_IP SS_LRN_SERVER_PORT from the VOS3000 server. If the connection succeeds, place a test call to a known ported US number and inspect the CDR record. A working LRN configuration will show the LRN value in the CDR alongside the dialed number. If the CDR shows no LRN field or routing appears incorrect, check your softswitch logs for LRN query errors.

What protocol does VOS3000 use for LRN queries?

The protocol used for LRN queries depends on the LRN service provider and the configured SS_LRN_SERVER_PORT. Some providers use TCP-based proprietary protocols, while others use SIP-based queries or HTTP/HTTPS REST APIs. VOS3000 supports the query format specified by the LRN server it connects to. The specific protocol details and query format should be obtained from your LRN service provider documentation.

Get Professional VOS3000 LRN Server Setup

Configuring VOS3000 LRN server settings correctly is essential for accurate US termination routing. Incorrect SS_LRN_SERVER_IP or PORT values will prevent LRN lookups from functioning, causing all ported US numbers to be misrouted. Our team specializes in VOS3000 number portability configurations and can help you integrate with any LRN service provider. (VOS3000 LRN Server Configuration)

From initial LRN server setup to troubleshooting existing configurations and optimizing query performance, we provide comprehensive support. Reach out today at +8801911119966 and ensure your VOS3000 system delivers accurate US termination routing.

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