Update docs for SIP and Tor Messenger

doc/EN/faq.org

 
 /Out of fashion/ but still working computer hardware tends to be cheap and readily available, yet still good for providing internet services.
 * Can I add more users to the system?
-Yes. Freedombone can support a small number of users, for a "/friends and family/" type of home installation. This gives them access to an email account, XMPP and the blog (depending on whether the variant which you installed includes those). To add a user login as root then run the command:
+Yes. Freedombone can support a small number of users, for a "/friends and family/" type of home installation. This gives them access to an email account, XMPP, SIP phone and the blog (depending on whether the variant which you installed includes those). To add a user login as root then run the command:
 
 #+BEGIN_SRC bash
 freedombone-adduser [username]

doc/EN/usage.org

 Enter your username (username@domainname) and password.
 
 Click on *Advanced* and make sure that *Encryption required* and *Ignore SSL certificate errors* are checked.  Ignoring the certificate errors will allow you to use the self-signed certificate created earlier.  Then click *Done* and set your Jabber account and Empathy to *On*.
+*** Using Tor Messenger
+Tor Messenger is a messaging client which supports XMPP, and its onion routing enables you to protect the metadata of chat interactions to some extent by making it difficult for an adversary to know which server is talking to which. You can download Tor Messenger from [[torproject.org]] and the setup is pretty simple.
 *** Using with Android
 Install [[https://f-droid.org/][F-Droid]]
 
 Selecting the server by pressing on it then connects you to the server so that you can chat with other connected users.
 
 /Note: if you don't know the default domain name and you did a full installation then it will be the same as the wiki domain name./
+** SIP phones
+Freedombone also supports SIP phones The username and domain is the same as for your email address, and the SIP password and extension number will appear within the README file in your home directory. Various SIP client options are available, such as CSipSimple on Android and Jitsi on desktop or laptop machines. Ideally use clients which support ZRTP, which will provide the best level of security.