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Setting up DNS records for Kamailio 4.x platform

Our IMS clients will use DNS service to resolve which transport protocol to preferr and which server provides that SIP service. Therefore we need for this purpose working DNS server with valid delegated zones. In our case we are administrating own DNS zone named So we will add required resource records, first we add NAPTR records and then valid SRV and A records

So, prepare your DNS records, in our case:

Upgrade on Virtualbox 4.3.4 – fail to start virtual machines – VT-x error

I'm using virtualbox to run couple of my virtual machines inside of the Windows 7 64bit. Two days ago I have upgraded my running Virtualbox software to new version 4.3.4. After upgrade I was not able to start and run any of my virtual machines (Win7 32it, Xubuntu, KaliLinux, Mint) which works fine inside of previous virtualbox version.
After start I have received window with message telling that VT-x is disabled inside of the BIOS. The log file I have found inside one of the machines telling the same: