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Choosing a Provider

Callgency AI supports three carriers: Twilio, Vonage, and Telnyx. Each shines in different markets and price brackets. This guide helps you pick the right one for every client.

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Overview Comparison

ProviderBest ForPricing ModelSetup Difficulty
TwilioUnited States & CanadaPer minute (rounded up)Easy (self-serve)
VonageInternational (per-second billing)Per secondMedium (manual approval)
TelnyxCost-conscious (esp. Australia)Per minuteHard (SIP configuration)

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Twilio

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Best For

United States and Canada - Ideal for US-centric campaigns

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Strengths

  • ✅ Quick, self-serve setup - buy numbers in minutes
  • ✅ High concurrency limits - perfect for large campaigns
  • ✅ Built-in voicemail detection - saves wasted agent talk-time
  • ✅ “Verified Caller ID” - mask calls with client’s existing phone number
  • ✅ Direct GoHighLevel SMS integration - same number for calls and texts

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Weak Points

  • ❌ Charges by the minute (rounded up) - 9-second voicemail costs a full minute
  • ❌ Non-US pricing is steep - ~7¢ USD per outbound minute in Australia

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Rule of Thumb

If the traffic is US-centric, stick with Twilio every time.

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Pricing Reference

  • US outbound: ~1-2¢ per minute
  • US inbound: ~1¢ per minute
  • Australia outbound: ~7¢ per minute
  • Monthly number rental: ~$1-2 per number

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Vonage

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Best For

Non-US regions where per-second billing matters

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Strengths

  • ✅ Bills per second - a 30-second call costs half a minute
  • ✅ Slightly cheaper headline rates than Twilio outside the US
  • ✅ Good international coverage

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Weak Points

  • ❌ No native voicemail detection - Callgency uses transcript-based fallback
  • ❌ No verified caller IDs
  • ❌ Onboarding is manual - email a rep, fill in forms, wait for approval
  • ❌ No GoHighLevel SMS tie-in - you’ll juggle separate SMS and voice numbers

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When to Use

Mid-size international campaigns where per-second pricing outweighs the admin hassle.

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Pricing Reference

  • Most countries: 2-4¢ per minute equivalent
  • Per-second billing - only pay for actual talk time
  • Monthly number rental: Varies by country

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Telnyx

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Best For

Australia and other non-US markets when cost is king and you still want Caller ID masking

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Strengths

  • ✅ Roughly half Twilio’s US rate (~3.3¢ USD per minute)
  • ✅ Supports verified caller IDs - pair with Twilio SMS for “one-number” experience
  • ✅ Modern dashboard, good documentation
  • ✅ Competitive international rates

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Weak Points

  • ❌ Charges by the minute (no per-second savings)
  • ❌ Occasional reliability quirks - sudden number blocks, quirky concurrency caps
  • ❌ No built-in voicemail detection
  • ❌ No direct GoHighLevel SMS integration
  • ❌ More complex setup (SIP trunking)

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Practical Stack for AU Clients

  1. Buy a Twilio number → connect to GoHighLevel for SMS + inbound voice
  2. Buy a Telnyx number → set Twilio number as verified caller ID
  3. Make outbound calls via Telnyx and reap the savings

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Pricing Reference

  • US outbound: ~3.3¢ per minute
  • Australia outbound: ~3-4¢ per minute
  • Monthly number rental: ~$1-3 per number

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Decision Cheat-Sheet

┌─ Calling the US? 
│  └─→ Use Twilio (cheapest, simplest, rock-solid)
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├─ Calling outside the US and need per-second billing?
│  └─→ Try Vonage (expect manual setup)
│
└─ Calling outside the US and want lowest cost per minute with Caller ID?
   └─→ Pair Telnyx (outbound) with Twilio (SMS/inbound)

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Feature Comparison

FeatureTwilioVonageTelnyx
Self-serve signup✅ Yes❌ Manual✅ Yes
Voicemail detection✅ Built-in❌ No❌ No
Verified Caller ID✅ Yes❌ No✅ Yes
GoHighLevel SMS✅ Direct❌ No❌ No
Per-second billing❌ No✅ Yes❌ No
Concurrency limits✅ High⚠️ Medium⚠️ Variable

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Final Tips

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Check Pricing Pages

Rates change frequently - always confirm current per-minute or per-second fees before committing to a provider.

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Benchmark Latency

Run test calls to your target market before migrating an entire campaign. Audio quality and connection speed vary by region.

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Keep Voicemail Detection in Mind

If you leave Twilio, plan for transcript-based detection. Test extensively to ensure accuracy.

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Review Compliance Rules

Some countries require local address verification before you can buy numbers. Check requirements for:
  • Business registration documents
  • Physical address proof
  • ID verification
  • Local representative (in some jurisdictions)

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Next Steps

  • Set up Twilio for US campaigns (easy)
  • Set up Vonage for international per-second billing (medium)
  • Set up Telnyx for cost savings with SIP trunking (hard)
Choose wisely, and your AI agents will dial cheaply, sound clear, and keep accountants happy.