Source note · SIP 503 and trunk out-of-service failures
Under RFC 7339's default loss algorithm the oc value is a percentage from 0 to 100 by which the client must cut the requests it forwards to the overloaded server; oc-validity is in milliseconds.
Checked 2026-09-25
- Vendor
- IETF
- Product
- SIP
- Subsystem
- overload control
- Deployment
- any
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- RFC 7339: Session Initiation Protocol (SIP) Overload Control — IETF / RFC Editor · tier 1 standards and regulators · Sections 7.1 and 4.3
Cite this note
APA
WarmTransfer. (2026, September 25). SIP 503 and trunk out-of-service failures: source note sip-503-trunk-failures-rfc7339-loss-algo. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-503-trunk-failures-rfc7339-loss-algo
BibTeX
@misc{warmtransfer-claim-sip-503-trunk-failures-rfc7339-loss-algo,
title = {SIP 503 and trunk out-of-service failures: source note sip-503-trunk-failures-rfc7339-loss-algo},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-503-trunk-failures-rfc7339-loss-algo},
note = {Source note sip-503-trunk-failures-rfc7339-loss-algo, checked 2026-09-25}
}