WARNING
If you just purchased your Nokia E-72 and are trying to use its in built VoIP application and from Control Panel > Settings > Connections > SIP settings
Than rest assured that it won’t Work
To get VoIP working You need to download and install SIP VoIP Settings Application from Nokia Website .
This application can be downloaded from http://www.forum.nokia.com/Tools_Docs_and_Code/Tools/Plug-ins/Enablers/SIP_VoIP_Settings_application.xhtml And you will have to register prior to downloading, to save you from this trouble I have also attached a copy of this application at the end of this post
I was really amazed, shocked and angry when I found out that E-72 does not come with an out of the box VoIP client, after all E-72 is the Nokia’s Flag ship mobile for Business Customers and VoIP is a very basic requirement of such phones.
Nokia really made it really confusing, if the built-in SIP Profile application does not work than why did they include it in Phone, so that everyone’s wastes an hours trying to get their VoIP Numbers registered ?
Please note the 3.1 version is for Symbian devices (S60 5.x) touch screen mobiles and does not work with E-72, I have tested version 3.x which is for S60 3rd edition phones and it is working fine as E-72 which is also carries the Symbian 3rd Edition OS.
After installation you will need to go to Control Panel > Net Settings > Advanced VOIP Settings to configure the VoIP (Note these setting will only appear AFTER you install the VoIP Settings Application 3.x)
Following is the link to directly download SIP VoIP settings App
SIP_VoIP_3_1_Settings_S60_5_x_v1_0_en
Note: If you are having problems in getting VoIP to work on your phone than don’t hesitate to post it in comment form below and we will try to help you as much as possible 
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[...] I was able to register my VoIP Number on Nokia E-72 I was faced with another daunting [...]
I downloaded the software as per your blog but still my nimbuzz sip voip is not working. I can hear the dial tone but voice is not getting from both end. Please help me to solve this issue.
@Riyas
This is not for Fring or Nimbuss or Sykpe, this software is for using the VoIP client that has been built in the phone by nokia
Do you have any idea that how we can use Nimbuzz sip voip thru Nokia E72?
Have you installed Nimbuzz? What problem are you facing ? Nimbuzz should work out of Box with E72