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Hi there,
A shot description:
My mobile Operator Vodafone RO stops me from using SIP services over its 3G (3.5G) for making calls over internet, thus being cheaper. The fee Vodafone is charging is about 3.5Euros and though it is not expensive I believe that my internet plan (500MB) should benefit for no such tax. Thus, under such issues, is there any app or tweak to make a by-pass and trick vodafone/n900/operator into believing it is on wifi?
please, fell free to bring new light upon this subject and let the community benefit from it.

GoRge (N900 user since august 2010, former E72 user)

it depends how they are blocking VOIP but the problem is that when you are using VOIP over 3g, you must send the VOIP packages via 3g -connection thus telling pretty clearly to your operator what you are doing (if they are interested)....

hmmm...so there is nothing tweakable around the n900?

You may be able to use a VPN and connect the phone. Battery goes quickly for me when enabled.

Theoretically speaking, what ivlok said is the tweak you're looking for if your service provider is doing packet inspection to filter out voip. A vpn would encrypt packets and your actual endpoint will not be your phone. The service provider will see a large amount of data but wont understand what it is and so should have no reason to filter it.

However, the latency of the traffic will increase considerably. Voice depends on low latencies - otherwise both parties notice a lag - almost like an international call, but without the distance.

i could give this a try only if the OpenConnect and OpenVPN would work. Seems that either I am knwoledgeless or there is someting wrong with these two apps.

any ideas, fellows?

g.

It's not as easy as just installing the OpenVPN app / applet.
Read this first. Once you've got it working between a your server and another desktop / laptop, use those settings on the n900.

Debugging a VPN on the phone is a pain - at least for me. I don't feel comfortable without multiple xterms tailing the debug outputs.

first things first,

openconnect is a OSS client to talk to a Cisco SSL (Anyconnect) type of VPN appliance.

OpenVPN is a complete OSS VPN solution, having both an client and a server side.

they can not be interchanged ... to talk to the same server side.

Both clients work perfectly fine (as foreseen) on N900, I continued the work from Lorelei for now in this thread on the OpenConnect-gui and the openconnect client application. Read as of Jan 2011 to follow along. The older versions are in extras-devel, the new ones only in the thread. I need to try to get them also in there ... my fault.

The OpenVPN client also works/worked fine on my N900, to talk to my dd-wrt router at home. I don't use it anymore since my new router/Wifi AP has a crappy dd-wrt support for now, but I hope I can get the solution back operational once my router is fully supported.

So there is no inherent problem with either of them on N900.

The OpenVPN guys have a very active support mailing list. Openconnect tends to be less config work (in the easier cases) as one normally only has to worry about the client params.
No server params to mess around with. Those are your network admins problem

Thus,
I decided to go for a test to use voip over 3G on Vodafone Ro carrier by paying the low fee of 3.13 Euros. Firstly, I must say that it works like a charm. If you make a calculus - after I finish my included minutes in the plan carrier the cost of this is quite afordable, taking into account the international calls I go for.

G, N900 User.