[FW1] How to control telnet access

[ssm <ssm@pacific.net.sg>]

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Hi,
 
Would appreciate if anyone could help me with this scenario:
 
User need to access Unix server via FW-1 using telnet.
How do I set up this rule in Checkpoint? 
How do I control his access: by user-id and/or his machine's ip address?
Do I use User or Client authentication?
 
Thanks for the help.
 
Regards
Chris