One erlang is a traffic load equal to 3600 seconds of calls on the same circuit, trunk or port during the busy hour, i.e. enough traffic to keep one circuit busy for one hour.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Unified Contact Center Enterprise
- Subsystem
- traffic engineering terminology
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 15.0(1)
- Checked
- 2026-09-25
Sources
- Solution Design Guide for Cisco Unified Contact Center Enterprise, Release 15.0(1) - Sizing and Operating Conditions for Reference Designs — Cisco Systems · tier 2 current vendor documentation · Contact Center Traffic Terminology > Erlang
Cite this note
APA
WarmTransfer. (2026, September 25). Erlang B and Erlang C for voice and contact center sizing: source note erlang-traffic-engineering-erlang-unit. WarmTransfer. https://warmtransfer.net/knowledge/claims/erlang-traffic-engineering-erlang-unit
BibTeX
@misc{warmtransfer-claim-erlang-traffic-engineering-erlang-unit,
title = {Erlang B and Erlang C for voice and contact center sizing: source note erlang-traffic-engineering-erlang-unit},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/erlang-traffic-engineering-erlang-unit},
note = {Source note erlang-traffic-engineering-erlang-unit, checked 2026-09-25}
}