OpenAI Realtime API
Infrastructure and APIDevelopers building speech-to-speech agents directly
Speech-to-speech models; WebRTC/WebSocket/SIP; tool calling
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Emerging Infrastructure and API vendors
36 Infrastructure and API listings are in this group. Page 3 of 4: OpenAI Realtime API, Phonic, Resemble AI, Rev AI, Rime, Roark.
These profiles stay at their own URLs and are left out of the sitemap until they meet the index rule. The full set of categories is on Emerging voice AI vendors.
Phonic
Infrastructure and APIDevelopers building phone agents
End-to-end speech model; Per-minute pricing; Workspaces
Resemble AI
Infrastructure and APIEnterprises securing voice channels
Deepfake detection; Voice cloning; Watermarking
Rev AI
Infrastructure and APIDevelopers needing STT
Async + streaming STT; Many languages; HIPAA
Rime
Infrastructure and APIVoice-agent builders
600+ voices; Low latency; Enterprise deployment
Roark
Infrastructure and APIVoice-agent teams
Scenario simulation; 500+ metrics; Human review
Sanas
Infrastructure and APIOffshore contact centers
Accent translation; Live translation; Speech enhancement
Sarvam AI
Infrastructure and APIBuilders targeting India
Indic STT; Bulbul TTS; Voice agents
SignalWire
Infrastructure and APIDevelopers and CPaaS buyers
AI Agent runtime; SIP/PSTN; Contact center
Sinch
Infrastructure and APIEnterprises needing global telephony
Voice API; Numbers; Contact center
Buyers can request quotes without opening a thin profile. Vendors with a full indexed page are in the directory.