I have 8 years of extensive experience in Open Source systems and offer consultancy in the following areas:

• Unix System Administration (Debian/Ubuntu, RHEL/CentOS/Fedora, FreeBSD)
• Migration from Proprietry Systems to Open Source
• Telephony (Asterisk, FreeSWITCH, sipXecs, SIP, IAX2, PSTN Termination, Conference Rooms, Mobile VOIP, Email-to-SMS)
• Web Server Administration (Apache, Lighttpd, nginx, Python, PHP, Ruby on Rails)
• Database Administration (MySQL)
• Mail Server Administration (Exim, AntiSpam/AntiVirus, Courier/Dovecot IMAP, Scalix Groupware)
• DNS Administration (BIND, nsd, djbdns with GeoDNS)
• File Server/Backup Administration (NFS, Samba, rsync, rdiff-backup, duplicity)
• Samba Administration (Domain Controller/Active Directory, File Sharing)
• Local or Geographically Diverse Load Balancing and High Availability
• Network Administration (TCP, UDP, BGP/OSPF/RIP/IS-IS with Quagga)
• Network Security (NetFilter/PF Firewalls, Intrusion Detection, Vulnerability Testing, OpenVPN, IPSEC)
• CRM Administration (SugarCRM)