GreenRiver SiriServer is a free Siri Proxy server which runs on GoogleSpeechApi. It converts speech packets to speex codec, which is then sent to Google for processing. Google then returns the speech in plain text to the server, which in turn sends the information to Siri on the jailbroken idevice. If you want to install Siri on a first generation iPad, you should be aware that this beta version could have some issues regarding connectivity. However, the installation procedure is listed stepwise below.
Step 1: In order for your device to connect to this new free Siri server, it should be operating on a jailbroken iOS 5 or a higher version. If not, you could download Redsn0w to jailbreak your device.
Step 2: From the Home Screen, launch the Cydia application, and then install spire tweak. Spire can be found by searching under the repository BigBoss, and then installed. The development of this tweak is credited to @chpwn and @rpetrich. It is required for the complete installation of a stable Siri interface on your jailbroken iPad 1. The download process may take a while since a package of 100MB needs to be downloaded from Apple servers.
Step 3: Restart your Apple iPad.
Step 4: Once you have successfully installed the Spire tweak, open the safari browser and visit http://siri.grwh.net/newca.pem. If you have previously installed the old certificate, you need to remove it from your device and install this new certificate. The link opens the iOS Profile installer, from where you need to install the certificate.
Step 5: Once the certificate has been installed successfully, go to the General option under Settings, and then go to Siri. Tapping the on switch will activate the voice assistant.
Step 6: The following address should be entered into Spire https://siri.grwh.net:1221in the Settings.
Step 7: The installation process is now complete. To check if you are connected, simply hold down the Home button, and then say “Hello Siri”. A hello back will confirm the connection. At http://siri.grwh.net/faq/ you can get the full list of commands that the GRWH Siri Server accepts.
This server can also translate a number of different languages by using Bing Translate API (Microsoft). This tool could prove to be extremely useful for you. The GRWH Siri Server is quite fast (1GB/s), providing 99% uptime. These Siri Servers located in California, USA are secured with the help of SSL encryption in order to prevent eavesdropping.