Practitioners report that switching SIP to TCP is often impractical in the field because many peers do not have TCP enabled or reachable, especially behind NAT.
field report · Checked 2026-10-02
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- SIP transport
- Deployment
- on-premises
- Region
- not restricted
- Release range
- practitioner pattern as of 2016
- Status
- field report
- Checked
- 2026-10-02
Sources
- SIP UDP fragmentation and Kamailio: the SIP header diet — Evariste Systems (Alex Balashov) · tier 5 independent technical research · Discussion of TCP as alternative
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting failed calls caused by large SIP messages over UDP: source note sip-fragmentation-troubleshooting-field-tcp-often-unreachable. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-fragmentation-troubleshooting-field-tcp-often-unreachable
BibTeX
@misc{warmtransfer-claim-sip-fragmentation-troubleshooting-field-tcp-often-unreachable,
title = {Troubleshooting failed calls caused by large SIP messages over UDP: source note sip-fragmentation-troubleshooting-field-tcp-often-unreachable},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-fragmentation-troubleshooting-field-tcp-often-unreachable},
note = {Source note sip-fragmentation-troubleshooting-field-tcp-often-unreachable, checked 2026-10-02}
}