# Conference call question

**URL:** <https://boards.straightdope.com/t/conference-call-question/138014>\
**Category:** Factual Questions\
**Created:** [November 21, 2002, 8:33pm UTC](https://boards.straightdope.com/t/conference-call-question/138014 "2002-11-21T20:33:52Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Mike\_H](https://avatars.discourse-cdn.com/v4/letter/m/ecd19e/32.png) [@Mike\_H](https://boards.straightdope.com/u/Mike_H)\
**Post date:** [November 21, 2002, 8:33pm UTC](https://boards.straightdope.com/t/conference-call-question/138014/1 "2002-11-21T20:33:52Z")

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I was wondering this when I had a conference call today when this happened: person A calls person B. Person A then conferences in person C. They talk for a while and then person A hangs up. Persons B & C can still talk to each other, even though they were talking to each other “through A”. Is there still a circuit through A even though he hung up? Is a seperate circuit established from B to C when A confrenced in C? If so, who pays for that? To confuse matters even further, C conferenced in another party D (while A was still on the line). If it matters, A was in Seattle, WA., B (me) was in Washington DC, C and D were in Peoria, IL.