Любой сервер теми или иными методами. Пример:
Астериск:
pbx*CLI> core show application Bridge
pbx*CLI>
-= Info about application 'Bridge' =-
[Synopsis]
Bridge two channels
[Description]
Usage: Bridge(channel[,options])
Allows the ability to bridge two channels via the dialplan.
The current channel is bridged to the specified 'channel'.
Options:
p - Play a courtesy tone to 'channel'.
This application sets the following channel variable upon completion:
BRIDGERESULT The result of the bridge attempt as a text string, one of
SUCCESS | FAILURE | LOOP | NONEXISTENT | INCOMPATIBLE