Call to mobile and add it to conference room

my operator always on conference room, and I want that the system call to the next customer (that ask we call him)
I want use ARI
the following code call to two phones but the don’t ear each other.
I it works I will change the extension to the conference room number and I solve the issue.

How can I make it works?

create_channel(endpoint=“Local/0545545454@from-internal”, extension=“054545454”, context=“from-internal” )