/usr/share/accounts/providers # cat vicar.provider
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE provider>
<provider version="1.0" id="vicar">
  <name>VICaR Provider Name</name>
  <icon>icon-m-service-sip</icon>
  <!--short-description>Route calls via VICaR</short-description-->
</provider>


/usr/share/accounts/providers # cat sip.provider
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE provider>
<provider version="1.0" id="sip">
   <name>SIP</name>
   <description>Setup your internet telephony</description>
   <icon>icon-m-service-sip</icon>
   <register type="formular"/>
   <install-existing>
        <setting name="address" type="string" is_displayname="true"/>
        <setting name="password" type="password"/>
   </install-existing>
</provider>