Teleconferencing multiple parties : is this a line or call equipment functionality

I noticed my HQ office's lines could conference in multiple parties (by pressing the
cradle & call additional parties) & it uses sort of PABX (phone four-digit extension
dialable).

But with direct Telco lines that we lay at our remote office, I can't do this & even
with the teleconf facility, it won't work.

Q1:
Is conferencing in multi parties a line function or the equipment function?  I'm
guessing it's a line function

Q2:
Does Telco support direct phone lines that support multi party conferencing?

Q3:
If I don't plan to upgrade /subscribe to this feature (by paying more), is there
any teleconf equipment or software or hardware that will enable this function
at our remote office?
sunhuxAsked:
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Bryant SchaperCommented:
This would be a function of the PBX you are using or the carrier. The carrier would offer a product, like webex or ringcentral on their PBX. Choir PBX may support it but each party is another call, so for example to have three people with two outside parties you would tie up two of your external lines and 1 internal line. Internal is not normally a concern. But if you wanted to conference say 20 outside parties you would have to have a PRI to support enough simultaneous calls.
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sunhuxAuthor Commented:
With a line/PBX that do not support teleconf, is there any teleconf equipment or software or hardware that will enable this function at our remote office?
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Bryant SchaperCommented:
What kind of PBX?  To support conferencing you would need hardware that can take and make calls. Basically a PBX with the feature. The current PBX may expand to support it, outside that you have to use a conference bridge solution, you carrier will offer one and you can certainly find them all over internet.
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sunhuxAuthor Commented:
Last query:

> conference bridge solution
Can point me to a link / url for one of the more common above solution?
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