SFLphone

From VoIP.ms Wiki

SFLphone is an open-source SIP/IAX2 compatible softphone for Linux. SFLphone is free software released under the GNU General Public License. Packages are available for all major distributions including Debian, openSUSE, Fedora, Mandriva and the latest Ubuntu releases.

Register the SFLphone Softphone with VoIP.ms

Open the SFLphone Softphone and under the Edit menu select the Accounts option. Then on the Accounts window click on the Add button.

This option will lead you to the Account Settings window, once you're there under the Basic tab complete the following fields:

• Alias: Enter a name of your choice (it can be your name or your company name)
• Protocol: Choose the protocol you will use SIP or IAX2
• Host Name: servername.voip.ms (Pick one of VoIP.ms multiple Servers)
• SIP User ID: 100000 (Replace with your Main SIP account or Subaccount UserID, e.g. 198765 or 198765_sub)
• User Name: 100000 (Replace with your Main SIP account or Subaccount UserID, e.g. 198765 or 198765_sub)
• Password: ********* (Use the SIP account password-By default the same as the Customer portal)
• Proxy: servername.voip.ms (Pick one of VoIP.ms multiple Servers)
• User-Agent: 100000 (Replace with your Main SIP account or Subaccount UserID, e.g. 198765 or 198765_sub)

 If you want to register your Main account, you can find the Username and Password information by logging into your Customer Portal. 
 If you want to register a sub-account you will have to use the credentials that you set when you created the sub-account.