When one fragment of a SIP-over-UDP INVITE is dropped, the receiver never gets the INVITE, so the caller sees only its own retransmissions and then a timeout rather than an error response from the far end.
inferred · Checked 2026-10-02
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- SIP transactions
- Deployment
- on-premises, multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Status
- inferred
- Checked
- 2026-10-02
Sources
- RFC 8085: UDP Usage Guidelines — RFC Editor (IETF) · tier 1 standards and regulators · Section 3.2 Message Size Guidelines (fragment-loss behaviour)
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting failed calls caused by large SIP messages over UDP: source note sip-fragmentation-troubleshooting-frag-drop-means-timeout. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-fragmentation-troubleshooting-frag-drop-means-timeout
BibTeX
@misc{warmtransfer-claim-sip-fragmentation-troubleshooting-frag-drop-means-timeout,
title = {Troubleshooting failed calls caused by large SIP messages over UDP: source note sip-fragmentation-troubleshooting-frag-drop-means-timeout},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-fragmentation-troubleshooting-frag-drop-means-timeout},
note = {Source note sip-fragmentation-troubleshooting-frag-drop-means-timeout, checked 2026-10-02}
}