Concurrent calls (CPS) and how to scale

Two limits

• CPS (calls per second) — how fast you can originate new calls. Default 10.
• Concurrent channels — how many calls can be in-progress at once. Default 30.

What happens when you exceed

• CPS exceeded → 503 Service Unavailable on the SIP response, no charge.
• Channel limit exceeded → same 503.

Your dialer should retry with backoff, not hammer.

Raising the limits

After your first 24h of clean traffic, open a ticket with:

• Trunk username
• Requested CPS and concurrent channels
• Expected destinations and typical ACD

We typically grant 50 CPS / 200 concurrent for established accounts, more for sustained volume.

Hard caps

No hard cap on the platform — we scale per-account based on observed quality. Accounts with sub-5% ASR or sub-15s ACD don't get raises until quality improves.