Voice Bots – AI Voice Campaigns

8 min read Last updated: June 23, 2026

What are Voice Campaigns?

Voice Bots let you automate phone calls using AI-powered voice technology (via ElevenLabs). Create voice agents that call your leads and hold natural, context-aware conversations — without your sales team needing to dial each number manually.

When to use Voice Bots: You want to combine email outreach with phone calls for higher-value prospects, or reach leads who don't respond to email. Voice calls can increase overall reply rates significantly when used as a follow-up channel in your campaign sequences. They're especially effective in traditional B2B segments (construction, manufacturing) where phone outreach is expected.

ElevenLabs Integration

Before creating voice agents, connect your ElevenLabs account:

  1. Go to Integrations → ElevenLabs
  2. Enter your ElevenLabs API key
  3. The system automatically syncs available voices and agents from your ElevenLabs account

Tip: ElevenLabs offers different voice qualities. For B2B outreach, use natural-sounding voices with a neutral accent — overly robotic voices reduce pickup rates. Configure Integration settings before creating your first agent.

Creating a Voice Agent

  1. Go to Voice Bots
  2. Click New Agent
  3. Configure the following:
    • Name – internal label for the agent
    • System prompt – instructions that define the agent's personality, tone, and script
    • Voice selection – choose from synced ElevenLabs voices
    • First message – the opening line when the lead picks up
    • Knowledge base – add context via text, URL, or file upload so the agent can answer questions about your product or service

Practical example: A system prompt like "You are a friendly sales assistant calling on behalf of Company XYZ. Your goal is to qualify interest and book a 15-minute demo. Speak naturally and don't read from a script." combined with a knowledge base URL to your product page creates a more natural conversation.

Voice in Sequences

Add VOICE steps to your campaign sequences alongside EMAIL and SMS steps. The system automatically calls the lead at the scheduled time based on your configured conditions.

Example multi-channel sequence:

  1. EMAIL (Day 1) – Introduction
  2. WAIT (3 days)
  3. EMAIL (Day 4) – Follow-up with case study
  4. WAIT (4 days)
  5. VOICE (Day 8) – AI voice call to leads who haven't replied
  6. WAIT (3 days)
  7. SMS (Day 11) – Final text reminder

💡 Tip: Use the transition condition "Only if no reply" on VOICE steps. This way, leads who already responded to email won't receive a cold call — which feels intrusive and can damage the relationship. See Sequence Editor → Transition Conditions for details.

Call Logs

Every call is recorded with detailed metadata:

  • Status – completed, failed, busy, no answer, voicemail
  • Duration – call length in seconds
  • Transcript – full conversation text for review
  • Outcome – AI-classified result (interested, not interested, callback requested, etc.)

Review call logs to refine your agent's script and improve conversion rates over time. Track which campaigns have the highest call connect rates and iterate on your prompts. Compare call performance against email-only sequences on your Dashboard to measure the lift from adding a voice channel.

Costs and Credits

Voice calls are billed separately from email sending. Costs depend on:

  • ElevenLabs subscription — you need an active ElevenLabs account with sufficient credits for voice synthesis
  • Call duration — longer calls consume more ElevenLabs credits
  • Call volume — set daily call limits per agent to control costs in campaign settings

⚠️ Note: Each failed or unanswered call still consumes small amounts of credits (call setup + voicemail if applicable). Monitor your ElevenLabs dashboard and set hard daily limits in ProperSend to avoid unexpected costs. Check credit usage in Settings.

Best Practices

  1. Use voice as a follow-up, not as a first touch — email first establishes context, then voice reinforces it
  2. Test different system prompts — record and review 10-20 calls before settling on a prompt
  3. Monitor transcript quality — check whether the agent handles objections naturally
  4. Pair with Unibox — if a lead leaves a voicemail or callback request, it should appear in your unified inbox