What you are describing is a bridge mode cti connection, where you will
get all extension on the pbx. You specify in the open request the
services you want. Try using CTITest first to open your connection to
see the events and how the masks work for determining which events to
receive. You dont specify the agent parameters in the open req if you
want a bridge mode connection. Those are used if you are establishing a
session for 1 specific agent. You want a bridge mode connection for all
agents. Peripheral ID is the icm configured id of the peripheral/acd
(e.g. 5000).

If you only want 10 extensions, you will have to create a new tcp/ip
connection and open req for each agent/extension.

Or alternatively, you could use CTIOS and write a filter mode
application specifying only those 10 agents (only 2 filter mode
applications are allowed per CTIOS Server pair).