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Connect Plivo SIP trunking to Vapi to enable your voice AI assistants to make and receive phone calls through Plivo’s global voice network.

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Prerequisites

India not supported: Indian phone numbers are not compatible with Vapi due to TRAI regulations requiring SIP termination on Indian servers. Vapi does not currently support this requirement. See Calling in India.
Optimize for latency: For best call quality, ensure your Vapi deployment is in a region closest to your call traffic. This minimizes audio delay and improves conversation flow.

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Part 1: Make Outgoing Calls

Enable Vapi to make outbound calls through Plivo.

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Step 1: Create IP Access Control List in Plivo

Vapi uses IP-based authentication for outbound calls.
  1. Go to SIP Trunking → Outbound Trunks → IP Access Control List
  2. Click Create New IP Access Control List
  3. Enter a name (e.g., Vapi-IPs)
  4. Add the following Vapi IP addresses:
    • 44.229.228.186/32
    • 44.238.177.138/32
  5. Click Create

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Step 2: Create an Outbound Trunk in Plivo

  1. Go to SIP Trunking → Outbound Trunks
  2. Click Create New Outbound Trunk
  3. Enter a name (e.g., Vapi-Outbound)
  4. Select the IP Access Control List you created
  5. Click Create Trunk
  6. Copy your Termination SIP Domain (e.g., XXXXXXXXXXXX.zt.plivo.com)

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Step 3: Configure Vapi

Use the termination domain from Plivo to configure outbound calling in Vapi. See Vapi Plivo integration guide for detailed steps.

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Part 2: Receive Incoming Calls

Route calls from your Plivo phone number to Vapi.

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Step 1: Create an Inbound Trunk in Plivo

  1. Go to SIP Trunking → Inbound Trunks
  2. Click Create New Inbound Trunk
  3. Enter a name (e.g., Vapi-Inbound)
  4. Click Add New URI and configure:
  1. Click Create Trunk

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Step 2: Connect Your Phone Number

  1. Go to Your Numbers
  2. Click on your phone number
  3. Set Application Type to Zentrunk
  4. Set Trunk to your inbound trunk
  5. Click Update Number

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Step 3: Configure Vapi

Register your phone number in Vapi to accept incoming calls. See Vapi Plivo integration guide for detailed steps.

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Troubleshooting

Debug logs:
  • Inbound issues: Check Plivo logs first
  • Outbound issues: Check Vapi logs first
For error codes, see Plivo hangup codes.