Standard Voicemail Detection
Our Standard Voicemail Detection performs real-time speech analysis using a sophisticated mathematical algorithm that distinguishes human speech from machine tones with remarkable speed and efficiency, all without any understanding of what is actually being said.
By precisely measuring the duration of the initial salutation, SIP Caller determines the answer type. Long greetings are characteristic of voicemail systems, while short phrases indicate a live person. When a beep tone is detected, the system immediately recognizes an answering machine and triggers the appropriate call flow.
Real-time speech analysis with no noticeable latency
Measures salutation length to detect voicemail greetings
Instant beep tone detection for voicemail systems
No AI cost, runs entirely on SIP Caller infrastructure
Works with any language and accent
AI-Based Voicemail Detection
The AI-Based Voicemail Detection streams call audio in real time to an AI agent that truly understands what is being said. This delivers significantly higher accuracy and unlocks powerful new capabilities that go far beyond simple voice analysis.
Because the AI agent comprehends the spoken content, it can separately identify a live human, a company IVR (Interactive Voice Response), and a voicemail system, executing a tailored call flow for each. It even handles automated call screeners: the AI can introduce the caller by name, state the purpose of the call, and respond to any DTMF prompts the screener requires.
Higher accuracy than algorithm-based detection
Identifies humans, voicemail systems, and company IVRs separately
Execute a different call flow for each answer type
Bypasses automated call screeners intelligently
Provides the caller name and call purpose to screeners
Responds to DTMF prompts requested by call screeners
Which mode is right for you?
Both modes integrate seamlessly into your campaigns. You can choose the best fit based on your accuracy requirements and budget.
Standard
Fast and cost-effective
Algorithm-based, no AI cost
Detects humans and voicemail
Great for high-volume campaigns
Works well for most use cases
AI-Based
Maximum accuracy and intelligence
Distinguishes human, IVR, and voicemail separately
Handles automated call screeners
Ideal for compliance-sensitive campaigns
AI cost paid directly to Azure or Gemini
Powered by Azure and Gemini
SIP Caller integrates with Microsoft Azure AI and Google Gemini as the AI engines for AI-Based Voicemail Detection. You connect your own Azure or Gemini account directly, so AI consumption is billed straight to you. No markup, no intermediary.
Microsoft Azure AI Speech and Language Services
Google Gemini
Use your own account, pay AI providers directly
No per-minute AI surcharges added by SIP Caller
