Claim record · SIP response codes and failure interpretation
A 486 Busy Here means the destination system was contacted successfully and the user is not willing or able to take additional calls at that end system.
fact · verified 2026-09-15
- Vendor
- IETF
- Product
- Session Initiation Protocol
- Subsystem
- response codes
- Deployment
- not restricted
- Region
- not restricted
- Release range
- current as of 2026-09-15
- Status
- fact
- Confidence
- 0.90
- Verified
- 2026-09-15
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · RFC 3261 section 21, 486 Busy Here
Cite this claim
APA
WarmTransfer. (2026, September 15). SIP response codes and failure interpretation: claim sip-486-busy-here. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-486-busy-here
BibTeX
@misc{warmtransfer-claim-sip-486-busy-here,
title = {SIP response codes and failure interpretation: claim sip-486-busy-here},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-486-busy-here},
note = {Claim sip-486-busy-here, verified 2026-09-15}
}