Moving SIP signalling from UDP to TCP or TLS removes dependence on IP fragmentation for large messages because TCP segments data to the negotiated MSS, which is why vendors give it as the primary fix.
inferred · Checked 2026-10-02
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- SIP transport
- Deployment
- on-premises, multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Status
- inferred
- Checked
- 2026-10-02
Sources
- Working with large SIP packets — Cisco Systems · tier 2 current vendor documentation · Solution section
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting failed calls caused by large SIP messages over UDP: source note sip-fragmentation-troubleshooting-tcp-tls-avoids-ip-frag. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-fragmentation-troubleshooting-tcp-tls-avoids-ip-frag
BibTeX
@misc{warmtransfer-claim-sip-fragmentation-troubleshooting-tcp-tls-avoids-ip-frag,
title = {Troubleshooting failed calls caused by large SIP messages over UDP: source note sip-fragmentation-troubleshooting-tcp-tls-avoids-ip-frag},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-fragmentation-troubleshooting-tcp-tls-avoids-ip-frag},
note = {Source note sip-fragmentation-troubleshooting-tcp-tls-avoids-ip-frag, checked 2026-10-02}
}