Is there a limit to how many outbound calls can be...
# ❓・ai-evy-supportm
manthu
12/24/2025, 9:56 AM@AI Evy Is there a limit to how many outbound calls can be setup with Retell?
Hi , nice to meet you!. I am using GHL as my main system, as I give these systems to chiropractic clinics and use GHL calendars for their schedulings. I was wondering if there's a limit on how many outbound calls we can setup with Retell campaigns, as I saw that for example GHL has a limit of 4 calls within 2 weeks, which is not useful for marketing purposes. Would be wonderful if with Retell we can set up 10-15 follow ups to happen and the agent just stops following up if the leads are not interested. Appreciate your response in advance!
a
AI Evy
12/24/2025, 9:56 AMThanks for tagging me @manthu. I'll look through relevant sources and get back to you shortly.
AI Evy
12/24/2025, 9:56 AM
To learn more, see the sources I considered:
[[1] 2025 B2B Guide to AI Phone Calls & Voice Agents | Retell AI | Retell AI](https://www.retellai.com/blog/b2b-guide-to-ai-phone-calls)
[[2] Question on concurrency limits when creating >20 outbound calls at once](https://discord.com/channels/1186424376300679209/1375439800408080505)
[[3] Outbound Calls (Make Calls)](https://docs.retellai.com/deploy/outbound-call)
[[4] AI Outbound Calls & Sales Calls with Voice Agents | Retell AI](https://www.retellai.com/blog/outbound-call-center-automation-and-the-role-of-ai-voice-agents)
AI Evy
12/24/2025, 9:56 AMFeel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.
AI Evy
12/24/2025, 9:56 AM### Answer
---
There's no documented limit on the number of outbound calls you can set up or schedule with Retell. You can configure multi-call follow-up sequences (like 10-15 follow-ups) based on your campaign logic. [(1) ]()
Key limits to be aware of:
Concurrency Limits
- The default concurrency limit is 20 concurrent calls (both inbound and outbound, whether connected or ringing) . [(2) ]()
- You need to implement concurrency checks on your side before creating calls—Retell does not queue calls beyond your limit.
CPS (Calls Per Second) Limits [(3) ]()
| Provider | Default CPS | Maximum CPS |
|----------|-------------|-------------|
| Twilio | 1 | 5 |
| Telnyx | 1 | 16 |
| Custom Telephony | 1 | Concurrency ÷ 20 |
Batch Calling
Retell supports batch calling for high-volume campaigns, allowing you to initiate thousands of outreach calls. [(4) ]() [(1) ]()
For your use case (10-15 follow-ups stopping when leads aren't interested) , you'd build that logic on your side—triggering outbound calls via the API based on lead status, and stopping the sequence when the agent captures disinterest or a successful outcome.