extension login - ?

Описание программного IP-телефона

In the Security Code field, enter a number that Communication Manager will use as a password for an agent during the extension login.

http://www.emag.ru/optixtream/vx800.htm

When a remote agent logs in to this extension using ХХХ Agent, the actual telephone that is locally connected to the Communication Manager port is disabled and cannot be used.

In the Security Code field, enter a number that the system will use as a
password that an agent uses while logging in as an extension.

"log in as an extension" что-то совсем с толку сбило