In Kamailio's tm module, retransmissions start at retr_timer1 (default 500 ms) and increase up to retr_timer2 (default 4000 ms); max_noninv_lifetime defaults to 32000 ms and max_inv_lifetime to 180000 ms.
Checked 2026-10-02
- Vendor
- Kamailio
- Product
- Kamailio
- Subsystem
- tm module
- Deployment
- on-premises
- Region
- not restricted
- Release range
- stable docs as of 2026-10-02
- Checked
- 2026-10-02
Sources
- TM Module — Kamailio project · tier 3 vendor-maintained repositories · Parameters retr_timer1, retr_timer2, max_noninv_lifetime, max_inv_lifetime
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting SIP 408 Request Timeout and calls that get no response: source note sip-408-timeout-troubleshooting-kamailio-retr-timers. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-408-timeout-troubleshooting-kamailio-retr-timers
BibTeX
@misc{warmtransfer-claim-sip-408-timeout-troubleshooting-kamailio-retr-timers,
title = {Troubleshooting SIP 408 Request Timeout and calls that get no response: source note sip-408-timeout-troubleshooting-kamailio-retr-timers},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-408-timeout-troubleshooting-kamailio-retr-timers},
note = {Source note sip-408-timeout-troubleshooting-kamailio-retr-timers, checked 2026-10-02}
}