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Specification sheet · Communication APIs (CPaaS)

Dollu Ltd

dollu.com

[email protected]

+91 777-500-2222

Voice API (Programmable Voice)

Make, receive and control calls from code - REST endpoints, SDKs in six languages, real-time media streaming for AI voice agents and Dollu's own carrier network underneath.

Programmable voice via REST and SDKs: outbound and inbound calls, IVR, recording, transcription, TTS/STT, conferencing and WebSocket media streams on Dollu's network.

SDK languages
6
Countries with numbers
110+
Platform availability
99.99%

At a glance

  • REST API and SDKs for Node.js, Python, Java, Go, PHP and .NET
  • Outbound, inbound, IVR, call control, transfer and conferencing
  • Bidirectional WebSocket media streaming for AI voice agents
  • Speech-to-text, text-to-speech and recording with transcription
  • Signed webhooks for every call event; idempotent requests
  • SIP interconnect to your PBX, contact centre or dialler
  • Numbers in 110+ countries provisioned from the same API
  • Sandbox, OpenAPI specification and per-second billing

Typical use cases

  • 01AI voice agents
  • 02Contact centre and outbound dialling
  • 03Reminders and voice notifications
  • 04Click-to-call and number masking
  • 05Voice inside SaaS products

Technical & commercial specifications

APIREST/JSON over HTTPS at api.dollu.com/v2; OpenAPI 3.1 specification
AuthenticationAPI keys with scopes or OAuth 2.0 client credentials; IP allow-lists
SDKsNode.js, Python, Java, Go, PHP, .NET; CLI for scripting
WebhooksJSON over HTTPS, HMAC-SHA256 signed, retries with backoff up to 24 h
MediaG.711, G.722, Opus on the wire; streaming PCM 8/16 kHz, µ-law, Opus over WSS
SpeechSTT and TTS in 40+ languages; SSML; answering-machine detection
ConferencingUp to 250 participants; recording; moderator and coach controls
CoverageOutbound to 230+ destinations; inbound numbers in 110+ countries
Rate limits100 CPS and 1,000 concurrent calls by default; higher on request
BillingPer second, no connection fee; postpaid or prepaid; USD/EUR/GBP/INR

Talk to Dollu about Voice API

Send us your destinations, volumes, sites or use case and we will return a proposal, pricing and a technical plan within one business day. Test credentials and the full service description and SLA document are available on request.

Contact sales online
Sales
[email protected]
Phone
+91 777-500-2222
Web
dollu.com
NOC
[email protected] · 24×7

Dollu Ltd · 2403A, Iconic Corenthum, Sector 62, Noida 201301, India. This sheet summarises the standard service; specifications may vary by country and are confirmed in the service order.

Online version: https://dollu.com/services/cpaas/voice-api