Practitioners report that IMS headers added by CSCF elements and SDP offering AMR and EVS codecs push INVITEs past 1300 bytes.
field report · Checked 2026-10-02
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- SIP message size
- Deployment
- on-premises
- Region
- not restricted
- Release range
- practitioner pattern as of 2023
- Status
- field report
- Checked
- 2026-10-02
Sources
- SIP and UDP Fragmentation — Cloud Telco Hub (Hossein Yavari) · tier 5 independent technical research · Root causes discussion
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting failed calls caused by large SIP messages over UDP: source note sip-fragmentation-troubleshooting-field-ims-grows-invite. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-fragmentation-troubleshooting-field-ims-grows-invite
BibTeX
@misc{warmtransfer-claim-sip-fragmentation-troubleshooting-field-ims-grows-invite,
title = {Troubleshooting failed calls caused by large SIP messages over UDP: source note sip-fragmentation-troubleshooting-field-ims-grows-invite},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-fragmentation-troubleshooting-field-ims-grows-invite},
note = {Source note sip-fragmentation-troubleshooting-field-ims-grows-invite, checked 2026-10-02}
}