Callivex SIP Trunking vs Gamma SIP Trunks

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.

Gamma SIP Trunks has no write-up on Specifiction yet; its figures are above.