Source note · SIP trace capture and ladder analysis
The ACK sent for a 2xx response to an INVITE is a separate SIP transaction, not part of the INVITE transaction.
Checked 2026-09-23
The ACK for a 2xx response to an INVITE request is a separate transaction.
- Vendor
- IETF
- Product
- SIP
- Subsystem
- transactions
- Deployment
- multi-tenant, on-premises
- Region
- not restricted
- Release range
- RFC 3261 (June 2002)
- Checked
- 2026-09-23
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · Section 6 Definitions, entry 'Transaction'
Cite this note
APA
WarmTransfer. (2026, September 23). SIP trace capture and ladder analysis: source note sip-trace-analysis-ack-2xx-separate-txn. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-trace-analysis-ack-2xx-separate-txn
BibTeX
@misc{warmtransfer-claim-sip-trace-analysis-ack-2xx-separate-txn,
title = {SIP trace capture and ladder analysis: source note sip-trace-analysis-ack-2xx-separate-txn},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-trace-analysis-ack-2xx-separate-txn},
note = {Source note sip-trace-analysis-ack-2xx-separate-txn, checked 2026-09-23}
}