Source note · CUBE high availability
After CUBE HA failover the SIP-layer signaling state is preserved but remote user agents must re-establish TCP sessions before sending further messages.
Checked 2026-09-25
Remote user agents must reestablish the TCP sessions (using port 5060) before sending subsequent messages.
- Vendor
- Cisco
- Product
- CUBE
- Subsystem
- failover behaviour
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.6 onwards; current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - High Availability on Cisco 4000 Integrated Services Routers and Cisco Catalyst 8000 Series Edge Platforms — Cisco Systems · tier 2 current vendor documentation · Restrictions (TCP sessions note)
Cite this note
APA
WarmTransfer. (2026, September 25). CUBE high availability: source note cube-high-availability-tcp-reestablish. WarmTransfer. https://warmtransfer.net/knowledge/claims/cube-high-availability-tcp-reestablish
BibTeX
@misc{warmtransfer-claim-cube-high-availability-tcp-reestablish,
title = {CUBE high availability: source note cube-high-availability-tcp-reestablish},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cube-high-availability-tcp-reestablish},
note = {Source note cube-high-availability-tcp-reestablish, checked 2026-09-25}
}