Nokia N75

Hello, I Need to Know ¿how can I do to configure my nokia N75 to speak for Voip. I have already determined the profile SIP and validates perfectly with the VOIP provider. The issue is that this phone does not bring default option speak for Voip (can be done by installing a client as fring, but quality is lost in the call and resources of the phone), and to finish setting must install a package ofrecia that Nokia is called "SIP_VoIP_Settings_v1_0_en", and this can configured the NAT and Firewall and when you finish doing so I would be giving an option to speak for Voip. The problem is that I could get the tool to configure, but I can also install it does not permit me to "execute". We need to know if someone can give some idea of how to fix this issue.

Thank you.

I apologize for the spelling, use translator