In Cisco's traffic model comparison, all of Poisson, Erlang B, Extended Erlang B, Erlang C, EART/EARC and Neal-Wilkerson assume infinite sources and Engset assumes finite sources. Blocked calls are held (Poisson), cleared (Erlang B, Engset, EART/EARC), retried (Extended Erlang B) or delayed (Erlang C).
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco IOS VoIP solutions
- Subsystem
- traffic model selection
- Deployment
- on-premises
- Region
- not restricted
- Release range
- document updated 2001-07-02
- Checked
- 2026-09-25
Sources
- Traffic Analysis — Cisco Systems · tier 2 current vendor documentation · Traffic Models > model comparison table
Cite this note
APA
WarmTransfer. (2026, September 25). Erlang B and Erlang C for voice and contact center sizing: source note erlang-traffic-engineering-model-table-blocked-handling. WarmTransfer. https://warmtransfer.net/knowledge/claims/erlang-traffic-engineering-model-table-blocked-handling
BibTeX
@misc{warmtransfer-claim-erlang-traffic-engineering-model-table-blocked-handling,
title = {Erlang B and Erlang C for voice and contact center sizing: source note erlang-traffic-engineering-model-table-blocked-handling},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/erlang-traffic-engineering-model-table-blocked-handling},
note = {Source note erlang-traffic-engineering-model-table-blocked-handling, checked 2026-09-25}
}