Source note · Kamailio and OpenSIPS SIP proxies
The Kamailio sl module adds a signature to the to-tag of local stateless replies to INVITE so that the matching ACKs can be filtered instead of forwarded downstream, and after a timeout all ACKs are let through.
Checked 2026-09-24
- Vendor
- Kamailio project
- Product
- Kamailio
- Subsystem
- sl
- Deployment
- self-hosted
- Region
- not restricted
- Release range
- 6.1.x
- Checked
- 2026-09-24
Sources
- SL Module — Kamailio project · tier 2 current vendor documentation · Overview (ACK filtering paragraph)
Cite this note
APA
WarmTransfer. (2026, September 24). Kamailio and OpenSIPS SIP proxies: source note kamailio-sip-proxy-sl-ack-filtering. WarmTransfer. https://warmtransfer.net/knowledge/claims/kamailio-sip-proxy-sl-ack-filtering
BibTeX
@misc{warmtransfer-claim-kamailio-sip-proxy-sl-ack-filtering,
title = {Kamailio and OpenSIPS SIP proxies: source note kamailio-sip-proxy-sl-ack-filtering},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/kamailio-sip-proxy-sl-ack-filtering},
note = {Source note kamailio-sip-proxy-sl-ack-filtering, checked 2026-09-24}
}