The nodes that I used usually had me sign on with a specific key combination, wait for the Echolink welcome message, then dial up the node I wanted to use. When done, another key was used to sign off the system. That may vary, I would imagine, from node to node. You should contact the owner of the node to see what their procedures are (and if you use their system, consider joining the club or at least send a subscription fee, depending on what the site requires. This isn't all cheap...)
73s Mike