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What is LCR (Least-Cost Routing)?

Last reviewed 1 min readReviewed by BroadNet engineering
Quick answer

LCR (Least-Cost Routing) automatically selects the cheapest available route for each message or call from a rate table of every path to a destination. Mature LCR weighs price against quality and compliance, not price alone — because the cheapest SMS path is often a grey route whose delivery is unreliable and whose sender IDs break. The right target is least effective cost: price per successfully delivered message. See /answers/sms-routing-lcr, /answers/what-is-grey-route-sms, and /operators/smsc-gateway.

Plain-language definitionVendor-neutralReviewed July 22, 2026
DiagramOperator-direct vs multi-hop routing
Operator-direct routeEvery hop is known and accountable
  1. Your application
  2. BroadNet platform
  3. Operator SMSC
  4. Subscriber handset
Multi-hop routeHops can change without notice and receipts can be lost
  1. Your application
  2. Aggregator
  3. Reseller
  4. Unknown hop
  5. Operator SMSC
  6. Subscriber handset
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$ curl -X POST https://api.broadnet.me/sms/sendSms
Response SLA
Test-access requestsReply within 1 business day
Production24 / 7 · < 15 min
Operator NOC24 / 7 · pager