Source note · SIP 503 and trunk out-of-service failures
When the Twilio termination CPS limit is exceeded, calls are rejected rather than queued, and the debugger logs error 32001 for trunk-level limits or 32012 for the pooled parent-account limit.
Checked 2026-09-25
- Vendor
- Twilio
- Product
- Elastic SIP Trunking
- Subsystem
- calls per second limits
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Calls per Second (CPS) — Trunking Termination — Twilio · tier 2 current vendor documentation · CPS enforcement and debugger alerts sections
Cite this note
APA
WarmTransfer. (2026, September 25). SIP 503 and trunk out-of-service failures: source note sip-503-trunk-failures-twilio-cps-reject. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-503-trunk-failures-twilio-cps-reject
BibTeX
@misc{warmtransfer-claim-sip-503-trunk-failures-twilio-cps-reject,
title = {SIP 503 and trunk out-of-service failures: source note sip-503-trunk-failures-twilio-cps-reject},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-503-trunk-failures-twilio-cps-reject},
note = {Source note sip-503-trunk-failures-twilio-cps-reject, checked 2026-09-25}
}