"I uploaded 100 contacts to be called, and it showed as scheduled. However, the calls didn't go through even after waiting for hours. I deleted the campaign batch calls and tried again, but the issue persisted. I received an email notification about exceeding the concurrency limit. Despite waiting for 4-5 hours, none of the calls went through, so I deleted the campaign. I then tried making a single call through a phone number, calling myself, and the concurrency error popped up. The issue remains unresolved. My call log shows a total of 200 scheduled contacts with cancelled calls. I deleted one to check if the number would decrease, but it still shows 200

Thank you for the detailed description. Since you received a concurrency limit error and calls remain queued/cancelled, could you confirm if your webhook endpoints for call status updates (like "end-of-call-report") are currently reachable and correctly configured in your Vapi assistant settings? This is important for clearing queued calls and updating concurrency counters. Sources: - [Call queue management with Twilio](https://docs.vapi.ai/calls/call-queue-management) - [Debugging voice agents](https://docs.vapi.ai/debugging)

you mean the end of call tools? because i am new to vapi

@Fonea What SIP Provider do you make use of?

Hi Fonea, If you need assistance with setting up or troubleshooting outbound call campaigns using Vapi, the following steps may be helpful: 1. **Set Up Your Campaign**: Use the Vapi Dashboard to create your outbound campaign. Ensure you have an active Vapi account, a configured assistant, and a phone number from a provider like Twilio (Vapi free numbers do not support outbound campaigns). Upload recipient details in a CSV file, ensuring it follows the correct format with properly named columns, including the required 'number' column in E.164 format. 2. **Configure and Launch**: Choose your campaign settings, upload your CSV with recipient information, and select the assistant that will manage the calls. Verify the configuration before proceeding. 3. **Monitor Performance**: Use the Campaign Dashboard to track and analyze campaign performance, view call completion rates, and see detailed call logs and outcomes. For more detailed guidance, you can refer to the [Outbound Campaigns Overview](https://docs.vapi.ai/outbound-campaigns/overview) and [Outbound Campaigns Quickstart](https://docs.vapi.ai/outbound-campaigns/quickstart). If you experience issues with calls not connecting, verify the configuration of your assistant and ensure your phone numbers are correctly set up with caller ID and STIR/SHAKEN to avoid being flagged as spam. For troubleshooting and debugging forwarding drops, check out the [Debugging Call Forwarding Drops Guide](https://docs.vapi.ai/phone-calling/transfer-calls/debug-forwarding-drops). These resources should help address any setup or connectivity issues.

@GIDEON I am using Twilio

Thanks for getting back to us and updating us We’ll share an update as soon as more information becomes available. We appreciate your understanding and patience as we continue our investigation.