There are many alternatives to direct long distance calling. Some offers better quality data transfers and lower costs. The regional packet data services used to be a popular option. In Scandinavia, the offerings of the local PTTs are called Datapak. Similar services are offered in most countries, often by a national telephone monopoly. Competitively priced alternatives are appearing in many countries as national telecom monopolies are brought to an end. For example, Infonet, TRI-P, and i-Com compete successfully with former monopolies for transport of data to and from North America. The Internet is a global network serving millions of mailboxes. It provides very cost-efficient mail exchange with private and public networks throughout the world. IXI is a packet data network operated by European Research centers. DASnet offers transport of mail between mail systems that have no direct connection with each others. (More about this in