Abstract
This chapter provides an overview of different architectures that are used. Google Talk Client is Google's answer to the instant messaging services from companies such as America Online, Yahoo, Skype, and MSN. It provides an overview of three solutions that are all different in their own way. Google Talk started off slow in beta for using an open source code but has grown due the ability of open connections and ease of use. To this day the instant messenger is fully interoperable with other communications services that support the open server-to-server XMPP (Extensible Messaging and Presence Protocol) protocol. The XMPP protocol allows the Google Talk Client to use such protocol for authentication, presence, and messaging. Skype has made itself into an institution for online peer-to-peer voice calls from anywhere in the world. It was even so good that eBay paid three billion dollars for this very small company. H.248 is a result of the ITU and the IETF coming together on one standard. Microsoft is using its new server to bring different IM providers and companies' together which are all different in their own way.
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