Trunks route groups and dial plans in Control Hub
Verified 2026-09-04 · 7 claims · sources tier 2
Trunks establish the connection between Webex Calling and the premises, terminating on a supported session border controller acting as a Local Gateway 7. Route groups organize these trunks to distribute calls or provide redundancy, and route groups may contain trunks from multiple locations 6.
How it works
Trunks within a route group handle call distribution and redundancy across locations 6. Rerouting to another trunk is triggered by specific SIP conditions: responses 401, 470, 480, and 606 when not preceded by a provisional 18x response; all other 4xx responses except 403, 404, 410, 413, 484, and 486; all 5xx responses; and a 12-second SIP timeout 5.
Configurable limits
Enterprise configurations and locations are subject to specific object limitations. A route group may contain a maximum of 10 trunks 1. A Webex Calling location may hold a maximum of 100 trunks 2. A maximum of 10000 route groups may be configured for one enterprise customer 4. Additionally, a maximum of 10000 dial plans may be configured per customer, and each dial plan may hold up to 10000 dial patterns 3.
Applicability
These claims apply to multi-tenant deployments of Webex Calling, with release ranges current as of 2026-09-04 7612435.
What remains uncertain
The provided claims do not specify behavior for SIP responses outside of the listed error codes, nor do they detail specific provisioning interfaces beyond Control Hub context. Readers should verify exact Local Gateway firmware dependencies and session border controller compatibility parameters.
See also
Governed by
- Enterprise dial plan design and normalizationstub — Dial plans select the trunk or route group for a pattern
Referenced by
- Webex Calling architecture and deployment modelsstub — Trunks and route groups carry premises-bound traffic
- SIP response codes — Failover behaviour is defined in terms of SIP responses
Claims
| # | Claim | Status | Confidence | Verified |
|---|---|---|---|---|
| 1 | A route group may contain a maximum of 10 trunks. Configure trunks, route groups, and dial plans for Webex Calling · Configurable limitations table | fact | 0.90 | 2026-09-04 |
| 2 | A Webex Calling location may hold a maximum of 100 trunks. Configure trunks, route groups, and dial plans for Webex Calling · Configurable limitations table | fact | 0.90 | 2026-09-04 |
| 3 | A maximum of 10000 dial plans may be configured per customer, and each dial plan may hold up to 10000 dial patterns. Cisco Preferred Architecture for Webex Calling — Design Overview · Dial Plans, page 30 | fact | 0.90 | 2026-09-04 |
| 4 | A maximum of 10000 route groups may be configured for 1 enterprise customer. Configure trunks, route groups, and dial plans for Webex Calling · Configurable limitations table | fact | 0.90 | 2026-09-04 |
| 5 | Rerouting to another trunk is triggered by SIP responses 401, 470, 480 and 606 when no provisional 18x response preceded them, by all other 4xx responses except 403, 404, 410, 413, 484 and 486, by all 5xx responses, and by a 12 second SIP timeout. Cisco Preferred Architecture for Webex Calling — Design Overview · Trunks and Route Groups, page 21 | fact | 0.90 | 2026-09-04 |
| 6 | A route group is a group of trunks that lets Webex Calling distribute calls over multiple trunks or provide redundancy, and it may contain trunks from multiple locations. Configure trunks, route groups, and dial plans for Webex Calling · Route group / Add a route group | fact | 0.90 | 2026-09-04 |
| 7 | A trunk in Webex Calling is a connection between Webex Calling and the premises, terminated on the premises by a supported session border controller acting as a Local Gateway. | fact | 0.90 | 2026-09-04 |
Sources
Cisco Preferred Architecture for Webex Calling — Design Overview
Configure trunks, route groups, and dial plans for Webex Calling
Cite this page
APA
WarmTransfer. (2026, September 4). Trunks route groups and dial plans in Control Hub. WarmTransfer. https://warmtransfer.net/knowledge/webex-calling-trunks-route-groups
BibTeX
@misc{warmtransfer-webex-calling-trunks-route-groups,
title = {Trunks route groups and dial plans in Control Hub},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/webex-calling-trunks-route-groups},
note = {Verified 2026-09-04}
}