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Callivex SIP Trunking
London, United Kingdom
What it is
Callivex SIP Trunking connects PBXs, contact-center platforms, and softswitches to the public telephone network over IP. Bidirectional trunks support inbound and outbound calling. Calls are billed per 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; customer-specific rates are quoted from destination mix, projected volume, and traffic profile. Trunks support IP authentication, SIP registration, or hybrid setups, with up to eight source IPs on the default IP-auth option. Callivex lists integration testing with Asterisk, FreeSWITCH, FreePBX, 3CX, Cisco UCM, and Microsoft Teams Direct Routing. Its network lists 218 termination destinations and numbers in 96 countries. Security features include encrypted signaling. Pricing is available on request, with web and API access.
For and against
For
- Per-second billing without rounding minimums
- Prepaid balance and live usage visibility
- Multiple trunk authentication methods
- 218 listed termination destinations
- Number porting and emergency calling
Against
- Pricing is available on request
- Prepaid balance is required
- Capacity limits set per account
- Toll-free availability follows local regulations
The verdict
Callivex offers configurable SIP connectivity with prepaid billing, broad destination coverage, and multiple authentication choices. Organizations should request a quote and confirm account capacity for their traffic profile.
Who it suits
It serves VoIP carriers, ITSPs, CPaaS and AI voice platforms, cloud PBX operators, resellers, enterprises, small businesses, and contact centers. It fits organizations needing inbound or outbound SIP connectivity.
Plans and prices
Wholesale SIP trunking
No channel fees · Capacity and call-rate limits set per account · Premium-rate and satellite destinations opt-in
Read 2 Oct 2026 · callivex.com
On the record
- 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.callivex.com · read 2 Oct 2026
- Billing
- Calls are billed per connected second with five-decimal rate precision, with no 60-second minimum or six-second rounding.callivex.com · read 2 Oct 2026
- Fraud controls
- Included account protections include country allowlists, spend caps, and anomaly detection; premium-rate destinations are opt-in.callivex.com · read 2 Oct 2026
- Network coverage
- Callivex lists points of presence in Europe, Asia, North America, and the Middle East, with 218 termination destinations.callivex.com · read 2 Oct 2026
- PBX compatibility
- Callivex says it integration-tests trunks with Asterisk, FreeSWITCH, FreePBX, 3CX, Cisco UCM, Microsoft Teams Direct Routing, and other listed systems.callivex.com · read 2 Oct 2026
- Phone numbers
- Callivex offers inbound local, national, and toll-free numbers in 96 countries, with toll-free availability subject to local regulations.callivex.com · read 2 Oct 2026
- Prepaid accounts
- Accounts use a prepaid balance with real-time balance and usage visibility, and no volume commitments.callivex.com · read 2 Oct 2026
- 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.callivex.com · read 2 Oct 2026
- Resilience
- The service describes active-active SBC deployment, per-call carrier selection, and automatic failover on 5xx errors and PDD spikes.callivex.com · read 2 Oct 2026
- 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.callivex.com · read 2 Oct 2026
- Support
- The network operations centre handles live faults 24 hours a day, while quotes, onboarding, and account changes are handled during UK business hours.callivex.com · read 2 Oct 2026
- 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.callivex.com · read 2 Oct 2026
- What it does
- Callivex provides bidirectional SIP trunks that connect PBXs, contact-center platforms, and softswitches to the public telephone network over IP.callivex.com · read 2 Oct 2026
- 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.callivex.com · read 2 Oct 2026
