Source note · SIP TLS handshake failures on trunks
From Cisco IOS XE 26.1.1, CUBE's default configuration no longer supports TLS 1.0 and 1.1 or their associated ciphers; using them requires 'system mode insecure'.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco Unified Border Element (IOS XE)
- Subsystem
- TLS version negotiation
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 26.1.1 and later
- Checked
- 2026-09-25
Sources
- Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - SIP TLS Support — Cisco · tier 2 current vendor documentation · Configure SIP TLS, transport tcp tls keyword description and 26.1.1 note
Cite this note
APA
WarmTransfer. (2026, September 25). SIP TLS handshake failures on trunks: source note sip-tls-handshake-failures-cube-insecure-mode-26-1. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-tls-handshake-failures-cube-insecure-mode-26-1
BibTeX
@misc{warmtransfer-claim-sip-tls-handshake-failures-cube-insecure-mode-26-1,
title = {SIP TLS handshake failures on trunks: source note sip-tls-handshake-failures-cube-insecure-mode-26-1},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-tls-handshake-failures-cube-insecure-mode-26-1},
note = {Source note sip-tls-handshake-failures-cube-insecure-mode-26-1, checked 2026-09-25}
}