Google refuses XMPP support
For many years, Google Talk has worked on the basis of the XMPP protocol, including supporting the XMPP Federation with other networks and making it possible, for example, using ICQ through the appropriate jabber transport in Google Talk (both in the application and in the Gmail chat via the web).
However, when you switch to Google Hangouts, presented at the latest Google I / O conference, which combines Google Talk and Google+, Google refuses XMPP support. The Google Talk Android app is automatically updated on the Google Hangouts. Chat in Gmail while you can switch to Hagouts and back to the classic view (respectively, communication with Jaber clients of other networks and contacts of ICQ and other transports is possible only in the latter case).
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However, when you switch to Google Hangouts, presented at the latest Google I / O conference, which combines Google Talk and Google+, Google refuses XMPP support. The Google Talk Android app is automatically updated on the Google Hangouts. Chat in Gmail while you can switch to Hagouts and back to the classic view (respectively, communication with Jaber clients of other networks and contacts of ICQ and other transports is possible only in the latter case).
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Source: https://habr.com/ru/post/180145/
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