How a Business Reduced
Telecom Costs 35%
with Smart Routing
A data-backed breakdown of the exact routing strategies, configurations, and provider decisions that delivered a 35% telecom cost reduction — and how your business can replicate it.
When a 45-employee professional services firm in New Jersey came to NetViaVoice with a monthly telecom bill north of $4,200, they had no idea how much waste was hidden inside their phone system. Through a structured audit and the implementation of five smart routing strategies — least cost routing, geographic call routing, international destination blocking, time-of-day routing, and trunk failover optimization — their monthly bill dropped to $2,720. That's a 35% reduction, or over $17,600 in annual savings. This guide walks through every decision, every configuration, and every result — so you can apply the same framework to your business.
- The Starting Point: A Bloated Telecom Bill Nobody Questioned
- Step 1 — The Telecom Audit That Revealed Hidden Waste
- Strategy 1 — Least Cost Routing (LCR)
- Strategy 2 — Geographic Call Routing Optimization
- Strategy 3 — International Destination Blocking
- Strategy 4 — Time-of-Day Routing
- Strategy 5 — Trunk Consolidation & Failover
- The Results: Full Financial Breakdown
- Implementation Timeline & ROI
- How to Apply This Framework to Your Business
- Smart Routing Cost-Reduction Checklist
- Frequently Asked Questions
📋 The Starting Point: A Bloated Telecom Bill Nobody Questioned
The business in this case study — a 45-person professional services firm handling legal, accounting, and consulting work across three New Jersey locations — had been paying the same telecom vendor for nine years. Monthly bills averaged $4,200, split across a mix of analog lines, a legacy PRI circuit, and a cloud phone system that was added as a stopgap during the pandemic remote work transition. Nobody had audited the setup since 2019.
When the firm's new operations manager flagged the telecom costs during a quarterly review, the initial reaction was that phones were a fixed cost — just a utility you pay. What followed was a structured 30-day telecom audit that revealed something very different: the majority of their monthly bill was not utility cost. It was waste — from inefficient routing decisions, unnecessary line rentals, unblocked international call access, and a complete absence of least-cost routing logic.
The firm engaged NetViaVoice to conduct the audit and implement a smart routing framework. The goal was ambitious: reduce the telecom bill by at least 25% without degrading call quality or losing any functionality. What they achieved exceeded the target by ten percentage points.
Could Your Business Save 35% on Telecom Costs?
NetViaVoice offers a free telecom audit for US businesses — we identify your waste and show you exactly how much you could save with smart routing.
🔍 Step 1 — The Telecom Audit That Revealed Hidden Waste
Before any routing changes were made, NetViaVoice conducted a complete 30-day telecom audit. This involved analyzing three months of itemized call records, inventorying all active lines and trunks, documenting call routing paths, and benchmarking the firm's per-minute rates against current market rates.
❌ What the Audit Found (Before)
- PRI circuit with 23 channels — only 8 used at peak
- Per-minute international rates at $0.18/min vs market $0.03
- No least cost routing — all calls using most expensive trunk
- International calling open to all 45 extensions
- 15 analog lines for 3 fax machines and legacy devices
- No after-hours routing — calls forwarding to expensive PSTN
- Three separate billing relationships with zero bundling discounts
- Unused DID numbers still being billed monthly
✓ What Was Implemented (After)
- SIP trunk with exactly 14 channels at peak demand
- Bundled international rates at $0.025/min average
- LCR engine routing every call to cheapest qualifying trunk
- International restricted to 6 extensions that actually need it
- FXO gateway for 3 fax lines — 12 analog lines eliminated
- After-hours routing to mobile at zero PSTN forwarding cost
- Single SIP trunk provider — NetViaVoice — unified billing
- Unused DIDs cancelled; active DIDs bundled in flat rate
💰 Strategy 1 — Least Cost Routing (LCR)
Least Cost Routing (LCR) is the practice of automatically directing each outbound call through whichever carrier or trunk offers the lowest rate to that specific destination — in real time. Without LCR, your PBX sends every call through the same trunk regardless of whether it's the cheapest option for that particular number. With LCR, the system compares rates across available trunks and routes intelligently.
Least Cost Routing
All US domestic calls automatically route through the trunk with the lowest per-minute or flat-rate bundled pricing. Typically saves 15–25% on domestic call costs.
Saved: ~$180/moInternational LCR
International calls route through the cheapest available carrier for each country code. The firm's international rates dropped from $0.18 to $0.025 per minute average.
Saved: ~$220/moMobile-Specific Routing
Calls to mobile numbers (which often cost more than landlines in certain countries) route through carriers with the lowest mobile termination rates.
Saved: ~$90/mo⚙️ How LCR Was Configured at the PBX Level
NetViaVoice configured the FreePBX dialplan to check the dialed number prefix against a real-time rate table maintained by our LCR engine. The priority order for each call type:
- Domestic US: NetViaVoice SIP Trunk (bundled flat rate) → Backup carrier
- International Europe: NetViaVoice International route → Direct carrier
- International Latin America: Specialized LatAm carrier → NetViaVoice fallback
- Emergency / 911: Direct PSTN — never route through LCR, always priority direct
🗺️ Strategy 2 — Geographic Call Routing Optimization
The firm operated from three New Jersey locations: Newark, Princeton, and Cherry Hill. Before optimization, calls between locations were routing out through the PSTN and back in — each leg billed as an outbound call. Internal calls between offices were costing money they shouldn't.
| Call Type | Routing Before | Routing After | Cost Before | Cost After |
|---|---|---|---|---|
| Newark → Princeton (internal) | PSTN out + PSTN in | SIP direct (on-net) | $0.02/min each leg | $0.00 (on-net) |
| Client calls (inbound) | Single number — no geo routing | Geographic routing to nearest office | PSTN forwarding cost | Direct SIP delivery |
| Outbound to local clients | All from Newark main number | Local DID per office area | Standard per-min | Lower local rate |
| After-hours forwarding | Forwarded to PSTN mobile | Forwarded via SIP to mobile app | $0.04/min | $0.00 (app) |
| Conference calls (inter-office) | PSTN conference bridge billed | SIP conference bridge on-net | $0.06/min/participant | Included in SIP plan |
🚫 Strategy 3 — International Destination Blocking
The audit revealed that 38 of 45 extensions had unrestricted international calling access. Analysis of three months of call records showed that only 6 employees ever made legitimate international calls. The remaining 32 international-enabled extensions were either unused or — in several cases — had made calls to high-cost personal destinations on company lines.
Additionally, provider-level destination blocking was applied on the NetViaVoice SIP trunk for all satellite phone numbers (+881, +882, +883), premium-rate ranges, and high-fraud destinations as covered in our destination blocking guide. This added a second layer of protection that no PBX misconfiguration could bypass.
⏰ Strategy 4 — Time-of-Day Routing
Before optimization, the firm's main line had a simple after-hours forwarding rule: forward everything to the office manager's cell phone via a PSTN mobile forward at $0.04 per minute. With 3–4 hours of after-hours calls per weekday and more on weekends, this was generating $140–$180 per month in invisible forwarding charges that nobody had thought to question.
⏰ Time-of-Day Routing Configuration Implemented
- Business hours (8am–6pm Mon–Fri): Standard ring group routing through SIP trunk at normal bundled rates
- After-hours weekday: IVR plays office hours message + option to leave voicemail, or press 1 for urgent escalation to on-call mobile via SIP app (not PSTN forward)
- Weekend: Voicemail with urgent option routing to SIP softphone app — zero PSTN forwarding charges
- Holidays: Holiday schedule pre-configured — no manual switching needed
- Result: PSTN mobile forwarding charges eliminated entirely — saving $155/month average
🔗 Strategy 5 — Trunk Consolidation & Failover
The firm had been paying three separate vendors: their original legacy telco for the PRI and analog lines, a cloud VoIP provider added during COVID, and a conference calling service. Each had its own minimum commitment, billing cycle, and support relationship. Consolidating everything onto a single NetViaVoice SIP trunk account — with proper failover configuration — delivered both cost savings and operational simplicity.
| Previous Setup | Monthly Cost | New Setup | Monthly Cost | Saving |
|---|---|---|---|---|
| Legacy PRI (23 channels) | $820 | SIP Trunk (14 channels, burstable) | $280 | $540/mo |
| Analog lines (15 lines) | $675 | FXO gateway (3 fax lines) + SIP | $85 | $590/mo |
| Cloud VoIP (COVID addon) | $490 | Consolidated into NetViaVoice | $0 (included) | $490/mo |
| Conference bridge service | $180 | SIP conference on-net | $0 (included) | $180/mo |
| International per-minute (all exts) | $640 | International (6 exts only, LCR) | $155 | $485/mo |
| After-hours PSTN forward | $155 | SIP softphone app (no cost) | $0 | $155/mo |
| Unused DIDs & features | $240 | Cancelled | $0 | $240/mo |
| Total Monthly | $4,200 | Total Monthly | $2,720 | $1,480/mo · 35% |
📊 The Results: Full Financial Breakdown
📅 Implementation Timeline & ROI
Call records analyzed, all vendor contracts reviewed, new SIP trunk provisioned with NetViaVoice. All existing numbers preserved via call forwarding during transition.
Investment: ~$0 (audit included)SIP trunk activated. LCR configured in FreePBX dialplan. International restrictions applied. PRI cancellation notice submitted (30-day termination).
First savings: $540/mo (SIP vs PRI) beginsFXO gateway installed for 3 fax lines. 12 analog lines cancelled. Softphone apps installed on all employee mobile devices.
Additional $590/mo in analog savings beginsGeographic routing configured. Time-of-day rules implemented. All three vendor contracts replaced with single NetViaVoice account. Unused DIDs cancelled.
Full $1,480/mo net saving achievedMonthly call analytics reviewed. LCR rates updated quarterly. System running on autopilot with NetViaVoice support on call.
$1,480/month recurring · $17,760/year🚀 How to Apply This Framework to Your Business
The strategies that delivered 35% savings for this firm are not unique to their situation. They reflect a universal framework that applies to any business currently on traditional telecom infrastructure or an unoptimized VoIP setup. Here's how to get started:
Request itemized call detail records (CDRs) from your current provider. You need to see every call: duration, destination, cost, and originating extension. This is the raw data for your audit.
Many businesses pay for far more lines than their peak usage requires. From your CDRs, calculate how many simultaneous calls you actually had during the busiest periods — typically 40–60% of provisioned lines is all that's ever used.
Compare your current per-minute rates to current SIP trunk market rates. International rates in particular have dropped dramatically — if you haven't renegotiated in 2+ years, you're almost certainly overpaying.
From your CDRs, identify which extensions actually made international calls. Restrict all others. This single step commonly saves 15–20% of international call spend immediately.
Work with NetViaVoice to implement least cost routing, geographic routing for multi-location businesses, and time-of-day rules that eliminate after-hours PSTN forwarding costs.
Every additional vendor relationship carries overhead — minimum commitments, admin time, separate billing cycles. Consolidating to a single SIP provider eliminates these redundancies and often unlocks volume discounts.
✅ Smart Routing Cost-Reduction Checklist
- Three months of CDRs pulled and analyzed for waste patterns
- Actual peak concurrent call count measured — lines right-sized
- PRI or analog lines audited — migrated to SIP where appropriate
- Current per-minute rates benchmarked against SIP market rates
- Least cost routing engine configured in PBX dialplan
- Multiple trunk providers tested for LCR failover and rate comparison
- International calling restricted to extensions with legitimate need
- High-risk international destinations blocked at PBX and provider level
- Geographic routing configured for multi-location businesses
- Inter-office calls routed on-net (zero PSTN cost)
- After-hours routing switched from PSTN forward to SIP softphone app
- Time-of-day routing configured with holiday schedule
- Unused DID numbers identified and cancelled
- Redundant vendor contracts identified and consolidated
- Conference bridge costs eliminated via on-net SIP conferencing
- Monthly CDR review scheduled — ongoing optimization calendar set
- Call analytics dashboard configured for proactive cost monitoring
Your Business Could Be Next
Book a free telecom audit with NetViaVoice. We analyze your current setup, identify exactly where your money is going, and show you a clear path to 25–40% savings.