Hi Retell team,I'm setting up a debt collection op...
# ❓・ai-evy-supportm
m4te
02/19/2026, 1:02 PM@AI Evy Hi Retell team,
I'm setting up a debt collection operation using Retell with Telnyx SIP trunking for outbound calls to Argentina.
My use case:
- 10 phone numbers rotating across contact lists
- ~5,000 calls/month (growing to 20k+)
- Average call duration: 42 seconds
- I need to run 20 concurrent calls per number (200 total simultaneous)
- The rotation logic is for retry attempts: each contact gets called up to 5 times from different numbers
My question:
What's the most cost-effective way to achieve 200 concurrent calls with number rotation? Specifically:
1. Can I use multiple workspaces under the same organization to distribute concurrency across numbers?
2. Is there a volume discount on concurrency slots for my use case?
3. Would an Enterprise plan make sense at my current volume (~$900/month, scaling to $3,000+)?
I'd appreciate any guidance on the best architecture for this setup.
Thanks,
a
AI Evy
02/19/2026, 1:02 PMThanks for tagging me @m4te. I'll look through relevant sources and get back to you shortly.
AI Evy
02/19/2026, 1:03 PM### Answer
Here's guidance for your debt collection setup with Telnyx SIP trunking:
## Concurrency Basics
Concurrency applies to all simultaneous active voice calls across your entire organization, not per agent or per number. [(1) ]() [(2) ]() Pay-As-You-Go users start with a quota of 20 concurrent calls. [(1) ]()
For 200 concurrent calls, you'll need to upgrade your concurrency limit through the Billing page in your dashboard.
## Telnyx CPS Limits
With Telnyx, the default CPS (calls per second) is 1, with a maximum of 16, and updates are instant. [(2) ]() For custom telephony, the maximum CPS is calculated as your concurrency limit ÷ 20. So at 200 concurrency, your max CPS would be 10.
## Concurrency Burst Option
If you experience traffic spikes beyond your base limit, you can enable Concurrency Burst which allows you to temporarily exceed your standard limit with a $0.10/min surcharge on burst calls. [(1) ]() Your burst limit would be the lower of 3× your limit (600) or your limit + 300 (500) , so 500 concurrent calls.
## Your Questions
1. **Multiple workspaces**: The documentation doesn't explicitly address distributing concurrency across multiple workspaces under one organization. You'd need to contact support for clarification on this architecture.
2. **Volume discounts**: The Enterprise plan includes volume-based discounts and custom call concurrency. [(3) ]()
3. **Enterprise plan**: At your projected volume of $3,000+/month, you'd qualify for the Enterprise plan, which is designed for companies with
AI Evy
02/19/2026, 1:03 PMlarge volumes (over $3k/month) . Benefits include volume-based discounts, custom call concurrency, and premium private Slack channel support.
## Recommendation
For your use case scaling to 200 concurrent calls and $3,000+/month, the Enterprise plan would likely be the most cost-effective path. Contact sales at [) to discuss volume discounts and custom concurrency configuration.
AI Evy
02/19/2026, 1:03 PM
To learn more, see the sources I considered:
[[1] Understand concurrency & limits](https://docs.retellai.com/deploy/concurrency)
[[2] concurrency calls](https://discord.com/channels/1186424376300679209/1460538188576592017)
[[3] Inside Retell AI | The Conversational AI Platform Behind Scalable AI Phone Systems | Retell AI](https://www.retellai.com/blog/inside-retell-ai-conversational-ai-phone-system)
AI Evy
02/19/2026, 1:03 PMFeel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.