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Callivex SIP Trunking

callivex.com

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Spec score 7.3 #12 of 27 in SIP Trunking Providers

What it is

Callivex SIP Trunking provides bidirectional SIP trunks linking PBXs, contact-center platforms, and softswitches to the public telephone network over IP. Calls are billed for each connected second with five-decimal rate precision, without a 60-second minimum or six-second rounding. Accounts use prepaid balances with real-time usage visibility and no volume commitments. Trunks support IP authentication, SIP registration, or a hybrid configuration; the default IP-authentication setup allows up to eight source IPs. Callivex lists integration testing with Asterisk, FreeSWITCH, FreePBX, 3CX, Cisco UCM, and Microsoft Teams Direct Routing. Its network lists 218 termination destinations and inbound local, national, and toll-free numbers in 96 countries. Security features include TLS 1.2 or newer signaling, SRTP media, optional mutual TLS, source-IP enforcement, and SIP scanner mitigation. Fraud controls include country allowlists, spend caps, and anomaly detection. Pricing is on request, with custom rates and prepaid billing.

Spec sheet

What it does
Callivex provides bidirectional SIP trunks that connect PBXs, contact-center platforms, and softswitches to the public telephone network over IP.Read 2 Oct 2026 · callivex.com
Security
The network page lists TLS 1.2+ signaling, SRTP media using AES-128 or AES-256, optional mutual TLS, source-IP enforcement, and SIP scanner mitigation.Read 2 Oct 2026 · callivex.com
Support
The network operations centre handles live faults 24 hours a day, while quotes, onboarding, and account changes are handled during UK business hours.Read 2 Oct 2026 · callivex.com
Headquarters
London, United KingdomRead 28 Sep 2026 · callivex.com
Authentication
Trunks support IP authentication, SIP registration, or a hybrid configuration, and the default IP-auth option supports up to eight source IPs per trunk.Read 2 Oct 2026 · callivex.com
Billing
Calls are billed per connected second with five-decimal rate precision, with no 60-second minimum or six-second rounding.Read 2 Oct 2026 · callivex.com
Fraud controls
Included account protections include country allowlists, spend caps, and anomaly detection; premium-rate destinations are opt-in.Read 2 Oct 2026 · callivex.com
Network coverage
Callivex lists points of presence in Europe, Asia, North America, and the Middle East, with 218 termination destinations.Read 2 Oct 2026 · callivex.com
PBX compatibility
Callivex says it integration-tests trunks with Asterisk, FreeSWITCH, FreePBX, 3CX, Cisco UCM, Microsoft Teams Direct Routing, and other listed systems.Read 2 Oct 2026 · callivex.com
Phone numbers
Callivex offers inbound local, national, and toll-free numbers in 96 countries, with toll-free availability subject to local regulations.Read 2 Oct 2026 · callivex.com
Prepaid accounts
Accounts use a prepaid balance with real-time balance and usage visibility, and no volume commitments.Read 2 Oct 2026 · callivex.com
Privacy and data
Callivex says its published data processing agreement covers call records and personal data used in routing, and call content is not stored unless recording is enabled.Read 2 Oct 2026 · callivex.com
Resilience
The service describes active-active SBC deployment, per-call carrier selection, and automatic failover on 5xx errors and PDD spikes.Read 2 Oct 2026 · callivex.com
Trial and onboarding
The SIP trunking page says customers can request a trial trunk, and the pricing page says a test trunk is provided after contract and initial top-up.Read 2 Oct 2026 · callivex.com
Who it serves
Callivex describes its customers as VoIP carriers and ITSPs, CPaaS and AI voice platforms, cloud PBX operators, resellers, enterprises, small businesses, and contact centers.Read 2 Oct 2026 · callivex.com

Plans and prices

Wholesale SIP trunking Priced on request Prepaid balance; custom rates quoted per customer based on destination mix, projected volume, and traffic profile. No channel fees · Capacity and call-rate limits set per account · Premium-rate and satellite destinations opt-in Read 2 Oct 2026 · callivex.com

Every Callivex SIP Trunking plan and price →

Strong points and limits

Strong points

  • Per-second billing without rounding minimums
  • Prepaid balance with live usage visibility
  • Supports multiple trunk authentication methods
  • Lists 218 termination destinations
  • Includes emergency and toll-free calling

Limits

  • Pricing is available only on request
  • Prepaid account funding is required
  • Toll-free availability depends on local regulations

Who it suits

It suits VoIP carriers, ITSPs, CPaaS and AI voice platforms, cloud PBX operators, resellers, enterprises, small businesses, and contact centers needing SIP connectivity.

Verdict

Callivex offers configurable SIP trunks, broad destination coverage, and detailed billing without volume commitments. Buyers should confirm custom rates, onboarding terms, and country-specific number availability before proceeding.

Where Specifiction places it

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