(OT) Need Some Expert Network Advice

[Jordan Aberle]

Have you tried this?

http://tinyurl.com/luwroy

On Sat, Jan 22, 2011 at 9:01 AM, Mark Phillips
<mark at phillipsmarketing.biz> wrote:
> This is not totally off topic.....Android is based on Linux....;-)
>
> I need some advice from an expert in networks to give me some advice on
> getting my phone to make WiFi calls....
>
> Anyway, I have a T-Mobile MyTouch 4g phone. It is supposed to be able to
> make calls over WiFi, which do not use an plan minutes...ie "free" calls. I
> depend on this phone for my business, and I have a wireless network at the
> office, so I don't have to pay for gillions of minutes. This worked great
> when I had my Blackberrys - I could talk all day in the office and not use
> any minutes. All of this is above board with T-Mobile - I actually pay a low
> monthly fee for unlimited WiFi calling.
>
> Anyway, much to my chagrin, I discovered yesterday that I had gone way over
> my plan minutes. I checked with T-Mobile, and none of my calls had gone over
> WiFi. The agent refunded all the charges for the over-plan minutes and gave
> me extra minutes to get through the rest of the month. She sent me to
> technical support, and we could not get my phone to make calls over my WiFi
> network. Even though the phone says I am connected to WiFi. So, I went to
> the T-Mobile corporate store in Fashion Square, and the manager (she has the
> same phone) and I tried to connect to the mall WiFi, and we could connect to
> the mall WiFi, but could not make WiFi calls. Same error - could not connect
> to T-Mobile network.  I then tried to make a WiFi call at Starbucks, and it
> worked! It also worked at Barnes and Noble after I agreed to the free
> Internet terms and services (didn't work before then).
>
> I googled for issues with WiFi calls with this phone, and found a lot of
> them. Sometimes it works and sometimes it doesn't. The error message that
> pops up says the phone cannot connect to the T-Mobile network. T-Mobile is
> aware of the issue, but does not have a fix or ETA for one.
>
> One posting had this to say about the WiFi calling.....
>
> The WiFi Calling app is Kineto's WiFi Calling app branded for T-Mobile.  The
> WiFi Calling app is an implementation of 3GPP GAN, which allows something on
> the Internet to get into a cellular network and do stuff (in this case, make
> and receive calls).If you care to pull up the most recent version of the
> spec, linked above, you'll find that "registering" (ie, logging into home
> base) involves these steps (get a glass of warm milk and see 8.4.1.6) ...
>
> 1) Performing a DNS query to get the address of thing it's trying to connect
> to (if necessary)
>
> 2) Setting up an IPSec tunnel to thing resolved in step 1 (called a SEGW)
>
>  3) Resolving and connecting to (using TCP over the tunnel setup in step 2)
> yet another thing called a GANC
>
> 4) Sending the GANC a "register request", which includes your phone's IMSI,
> information about the cell you're currently connected to, or last connected
> to if no longer connected, and other stuff
>
> 5) Getting back a response that the GANC is happy with you and all is well
>
> I started to think that perhaps I have a router issue on my network. I have
> a Linksys WRT54G wireless access point going through a BEFSX-41 Linksys
> router to my cable modem. I checked the routers, and IPsec is enabled for
> both. The WRT54G uses MAC filter to allow only certain devices to connect,
> and WPA Personal, AES algorithm, and a shared key of 64 characters in it.
> The WRT54G says I am connected to the phone when I enable WiFi on the phone.
>
> This is a long way to get to my question...thanks for staying with me. is
> there a way to look at what the phone is doing when I try to enable WiFi
> calling to see where it fails? A wireless sniffer?? Does any of the above
> give you network gurus an idea of what may be wrong and if it could be in
> issue with my router?
>
> Thanks for any help you can provide....I would hate to go back to a
> Blackberry as I really like Android now!
>
> Mark
>
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