CSipSimple¶
CSipSimple is the basis for all OStel mobile client work. It is under active development and is built on a mature SIP library. It supports SSL or TLS and integrates a patchset to pjsip to support ZRTP.
OStel App Setup
Go to https://guardianproject.info/downloads/ in your browser. Scroll to the bottom of the page. Install the OStel app with OSTel-debug.apk. The .apk installs the app, the .asc verifies the integrity of the application.
Direct Link: https://guardianproject.info/downloads/OSTel-debug.apk
Now that OStel app is installed, go to the applications folder and open OStel.
Click User name. Add the user name we sent to you in the email (ex. 1001). Click OK to continue.
Click Password. Add the password we sent to you in the email. Click OK to continue.
Click Save to continue.
You should see it read "Registering" for a few seconds until the bar to the left of your account name turns Green and reads Registered.
Congratulations! You've successfully signed in.
CSipSimple App Setup
Install CSipSimple 
The official CSipSimple app from either of these app markets will work:
Now that CSipSimple is installed, go to the applications folder and open CSipSimple.
CSipSimple Wizard Settings 
Opening CSipSimple for the first time should bring up the "Add Account" menu. If not click "+ Add Account".
Under Choose Wizard, scroll to the bottom and click "Worldwide Providers"
A dropdown menu should reveal more options. Scroll down to "OSTel". The icon should be a green lock in a hexagon.
You should see "*Create account*". Underneath you should see "Ostel" as Account Name.
Click User name. Add the user name we sent to you in the email (ex. 1001). Click OK to continue.
Click Password. Add the password we sent to you in the email. Click OK to continue.
Click Save to continue.
You should see it read "Registering" for a few seconds until the bar to the left of your account name turns Green and reads Registered.
Congratulations! You've successfully signed in.
Test Your SIP Connection
From the dial pad, dial 9-1-9-6 then click the green receiver icon at the bottom. Speak into the microphone. You should hear yourself. If so, you have successfully completed the echo test and your client should be fully functional. Way to go. You're on your way to being an elite user.
Troubleshooting
I changed my settings but I'm getting the same error.
Try to exit the application and restart it. Click "Back" until you read the dial pad. Click "Settings" to reveal the options Menu. Click "Disconnect" to exit the app completely. Launch the app again from the applications folder and it will reboot and try to connect using the new settings you entered.
My connection is now inactive. What happened?
Has the connection been over your 3G/4G connection. Perhaps the provider is blocking our SIP ports. Please try wifi. If this happens repeatedly, please notify us and we will look into it.
I tried to use another SIP client and it doesn't work.
Some clients do not allow an SSL connection. Tanstagi recently closed their 5060 port and so it will not work on clients that pass information in plaintext. This is good for your security.
I'm running Cyanogen. Why isn't CSipSimple working?
Good question. It should. But it doesn't right now. We're looking into this. Hopefully it will be fixed soon.
Can we record your phone calls?
Not even us pros at Guardian can your calls if you've encrypted them with ZRTP. Noone else can either.
Are you logging any data?
While we're in the Alpha testing phase we have to log some data in order to best develop and test the tool. We do our best to log this data securely and with privacy considerations in mind.
I'm running Orbot. Why isn't CSipSimple working?
Unfortunately, VOIP communication doesn't work over a Tor connection. Please turn off Orbot when running OStel.
My phone won't allow me to install the CSipSimple App.
Have you enabled your phone to install apps from 3rd parties? Go to Settings then click on Applications. Under Unknown sources, make sure that the box is checked, allowing the installation of non-Market applications.
What are the details?
So glad you asked! Check out the full details about our software and hardware on https://guardianproject.info/wiki/OSTN
Is there more info on CSipSimple?
CSipSimpleIt can also be rebranded and distributed under an open source license. This means a small client application can be distributed to add customization settings and branding to the application without forking the code base.
How can I get my friends involved?
Alpha testing is more fun when doing it with friends. We're always looking for smart and passionate people. They can sign up at https://ostel.me/ or follow us on Twitter https://twitter.com/#!/guardianproject or on our Blog https://guardianproject.info/blog/ to find our when they can become a tester too!
Thanks for joining us and remember to keep dreaming of those electric sheep.