Trillian supports optional connectivity with ICQ, allowing you to pull down your existing ICQ contacts to send and receive instant messages. You must have an existing ICQ account to leverage these features!
Connecting to ICQ
Click the Trillian button in the upper left of your contact list and click Settings:
Click the IM Accounts section, click Add a new account, and click ICQ:
Type your existing ICQ UIN and password and click Connect.
What ports are required to connect to ICQ?
ICQ uses TCP/5190 and TCP/443 by default, but can tunnel through only TCP/443 in a restrictive environment.