Setting up my sip account on my nokia phone

[#1]

I've tried to set up my plusnet sip account on my nokia mobile, but as yet have been unsuccessful.
Does anyone have ideas on the settings I need to enter into my mobile to allow me to make sip calls using my plusnet broadband phone account? 
Any help greatly appreciated....

[#2]

You don't say what model phone you have.
This is for the N95
Have a read through the Broadband Phone forum for info on other phones.
http://community.plus.net/forum/index.php/board,39.0.html