Voice Termination

Direct Tier-1 Routes Across 150+ Countries.

A-Z voice termination with guaranteed ASR, low PDD, and carrier-grade reliability — no grey routes, no third-party aggregators, no dead air.

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SOFTTOP · LCR ENGINE
TX
Outbound Call
+852 2xxx xxxx · Hong Kong Enterprise
73% ASR
LCR ROUTE SELECTION
Tier-1 Direct
0.9s PDD73% ASR
SELECTED
Regional Hub
1.8s PDD58% ASR$0.0014/min
Aggregator
3.2s PDD41% ASR$0.0006/min
✓ Route selected · Tier-1 Direct0.9s · 73%
150+
Countries
VOICE TERMINATION

What is voice termination?

Voice termination routes outbound calls from your VoIP system across carrier networks to their destination — landline, mobile, or PSTN endpoint. Call quality is determined by the routes and hop count your provider uses. Softtop's direct Tier-1 interconnects cut unnecessary hops for lower latency and cleaner audio on every call.

ASR
Answer-Seizure Ratio
% of calls that successfully connect to the destination.
ACD
Avg Call Duration
Longer ACD signals good route quality and live traffic.
PDD
Post-Dial Delay
Seconds from dial to first ring — lower is better.
Jitter
Packet Variation
Variation in voice packet arrival — affects audio clarity.
HOW IT WORKS

How Softtop voice termination works.

01

Call Initiation

Your PBX or VoIP system originates the call and Softtop's SIP layer digitizes voice into packets.

02

Intelligent Routing

The LCR engine picks the optimal carrier path — balancing cost, quality, and coverage in real time.

03

Tier-1 Interconnect

Packets travel direct through Tier-1 carrier interconnects — no grey routes, no aggregators.

04

PSTN Handoff

The call completes at the destination with verified CLI delivery and a clean audio signal.

TIER-1 QUALITY

Why route quality determines call quality.

Not all termination providers use the same routes. The three-tier system defines exactly what you get — and Softtop operates at Tier 1 across all 150+ countries, not just North America or Europe.

Tier 1
SOFTTOP
INFRASTRUCTURE
Full direct ownership
HANDOFFS
Minimal (1–2)
QUALITY
Premium — consistent ASR/ACD
BEST FOR
Enterprise, high-volume, regulated
Tier 2
INFRASTRUCTURE
Partial + Tier-1 partnerships
HANDOFFS
Moderate
QUALITY
Good, with variability under load
BEST FOR
Mid-market businesses
Tier 3
INFRASTRUCTURE
Relies on Tier-2 networks
HANDOFFS
Many
QUALITY
Variable — grey route risk
BEST FOR
Budget-first, low-stakes traffic
FEATURES & CAPABILITIES

Everything your voice traffic needs.

A-Z Global Termination
Full destination coverage across 150+ countries on a single contract.
CLI Routes
Verified caller ID delivery — critical for contact centers and compliance.
NCLI Routes
Cost-optimized non-CLI paths for high-volume traffic.
Least-Cost Routing (LCR)
Automatic carrier selection balancing quality and cost per destination.
Automated Failover
Traffic reroutes instantly if a carrier path degrades — no manual work.
STIR/SHAKEN Compliance
Caller ID authentication to reduce fraud and improve answer rates.
AES-Encrypted SIP Trunks
End-to-end voice traffic encryption protecting every call in transit.
Real-Time Analytics
Live dashboard — ASR, ACD, PDD, and jitter monitoring per destination.
24/7 Dedicated Support
Expert engineers available around the clock, not a ticketing queue.
ROUTE QUALITY

Why route quality matters for your business.

Poor voice termination costs more than the per-minute savings from a cheap provider. When calls fail or CLI is stripped, the downstream costs are real.

Softtop's STIR/SHAKEN-compliant SIP trunks and direct Tier-1 infrastructure remove each of these risks at the infrastructure level — before the call reaches your agent.

Lost conversions

Agents hit voicemail on calls that should have connected.

Compliance exposure

Regulated industries need call records with verified caller ID.

Customer attrition

Poor audio quality gets blamed on your brand, not your carrier.

Grey route risk

Unverified routes bypass STIR/SHAKEN and invite fraud penalties.

COMPARISON

Softtop vs. generic wholesale VoIP termination.

The uptime difference alone is significant: 99.9% allows 8.7 hours of downtime per year. Softtop's 99.999% reduces that to under 5 minutes.

FEATURE
GENERIC PROVIDER
SOFTTOP
Uptime guarantee
99.9% (4-nines)
99.999% (5-nines)
Route type
Mix of Tier-1 / grey routes
Direct Tier-1 only
Global coverage
Limited regions
150+ countries
APAC routing
Often via US/EU hubs
Direct APAC via Hong Kong HQ
Security
Basic TLS
STIR/SHAKEN + AES-encrypted SIP + fraud detection
LCR engine
Manual rate tables
Automated real-time LCR
Platform scope
Voice only
Voice + Messaging + Global Numbers + Contact Center
Support
Ticketing / SLA response
24/7 dedicated engineering support
WHO WE SERVE

Built to scale across every segment.

01

ITSPs & VoIP Resellers

A-Z rate sheets and direct Tier-1 quality at wholesale scale.

02

Contact Centers & BPO

High-ASR CLI routes and automated failover for outbound campaigns.

03

Global Enterprises

One contract, 150+ countries — consistent SLAs across every region.

04

Developers & Builders

SIP API integration with real-time call quality metrics.

ONE PLATFORM

Voice termination plus everything else.

Softtop combines wholesale-grade voice termination with a full unified communications stack — voice, messaging, global numbers, and contact center on one platform, one support team, one invoice.

USE CASES

Every operator that moves voice at scale.

Tier-1 termination built for the teams and platforms that can't afford a bad route.

Tier-1 routes99.999% uptimePer-second billingCLI guaranteed
ITSPs & Carriers

A-Z termination with direct Tier-1 interconnects, CLI and NCLI route options, and LCR for cost-efficient traffic management.

A-Z routesCLI / NCLILCR
BPOs & Call Centers

High-volume outbound dialing with predictable per-minute rates, full CDR export, and the capacity to scale campaigns overnight.

Outbound dialingCDR exportCampaign scaling
Conferencing Providers

Dial-in bridge termination with precise DTMF handling, toll-free access support, and the uptime conferencing SLAs demand.

Bridge terminationDTMF handlingToll-free access
UCaaS Platforms

Embedded calling and CPaaS integrations backed by carrier-grade SIP routing — no third-party aggregator in the middle.

Embedded callingCPaaS integrationSIP routing
VoIP Resellers

Wholesale route access with flexible traffic management, route diversity, and volume-based pricing for high-margin resale.

Wholesale pricingRoute diversityVolume tiers
Enterprise Voice

Branch office lines, remote worker voice, and automatic failover routing that keeps the business talking during any outage.

Branch linesRemote workersFailover routing
FAQ

Frequently asked questions about voice termination.

Everything you need to know about A-Z routing, Tier-1 quality, and Softtop's infrastructure.

Voice termination is the routing of outbound calls from your VoIP system to the PSTN or a destination endpoint. Voice origination is the opposite — inbound calls from the PSTN arriving into your VoIP system. Softtop provides A-Z termination alongside global origination numbers in 100+ countries, managed from a single dashboard.
A-Z termination refers to a provider's ability to route calls to any destination globally — from A to Z — under a single service agreement. Softtop's A-Z termination covers 150+ countries, using direct Tier-1 carrier interconnects for every destination rather than routing specific regions via lower-quality transit providers.
A CLI (Calling Line Identification) route delivers the caller's phone number to the destination, ensuring the recipient sees a valid, verified number. An NCLI (Non-CLI) route does not deliver caller ID. CLI routes are essential for contact centers, outbound sales, and compliance-sensitive industries. Softtop provides both, with CLI routes verified through STIR/SHAKEN.
LCR is an automated routing mechanism that selects the most cost-effective carrier path for each call in real time, based on destination, current carrier rates, and quality metrics. Softtop's LCR engine evaluates all available direct routes and selects the optimal combination of cost and quality — so you never pay a premium for a destination where a cheaper direct route delivers the same ASR and ACD.
Softtop guarantees 99.999% uptime — five-nines — across 70+ global Points of Presence. This means under 5 minutes of potential downtime per year. Automated failover ensures that if any carrier path degrades, traffic is rerouted instantly with no manual intervention required.
Yes. All voice termination traffic on Softtop runs over AES-encrypted SIP trunks. Softtop is STIR/SHAKEN compliant and operates real-time fraud detection to identify spoofed calls, toll fraud, and grey-route injection before they affect your traffic.
Softtop is headquartered in Hong Kong, with direct carrier interconnects across the Asia-Pacific region. Calls terminating to China, Japan, South Korea, Southeast Asia, and Australia route through regional Tier-1 infrastructure rather than bouncing through North American or European hubs — resulting in lower PDD, lower jitter, and higher ASR for APAC-bound traffic.

Start routing on direct Tier-1 infrastructure.

150+ countries. 70+ PoPs. 99.999% uptime. Onboarding handled for you.

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