Cisco's command reference describes a global transport switch command that switches transport for SIP messages larger than 1300 bytes, and states the dial-peer voice-class sip transport switch command takes precedence over it.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco Unified Border Element
- Subsystem
- SIP transport
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- Cisco IOS Voice Command Reference - T through Z - voice-class sip error-code-override through vxml version 2.0 — Cisco Systems · tier 2 current vendor documentation · voice-class sip transport switch: Usage Guidelines and Related Commands table
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting failed calls caused by large SIP messages over UDP: source note sip-fragmentation-troubleshooting-cube-global-switch-1300. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-fragmentation-troubleshooting-cube-global-switch-1300
BibTeX
@misc{warmtransfer-claim-sip-fragmentation-troubleshooting-cube-global-switch-1300,
title = {Troubleshooting failed calls caused by large SIP messages over UDP: source note sip-fragmentation-troubleshooting-cube-global-switch-1300},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-fragmentation-troubleshooting-cube-global-switch-1300},
note = {Source note sip-fragmentation-troubleshooting-cube-global-switch-1300, checked 2026-10-02}
}