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https://ivannikitin.com/2006/09/17/gtalk-to-voip-d1-88-d0-bb-d1-8e-d0-b7-d0-bc-d0-b5-d0-b6-d0-b4-d1-83-gtalk-d0-b8-windows-live-messenger-d0-b8-d0-bb-d1-8e-d0-b1-d1-8b-d0-bc-d1-82-d0-b5-d0-bb-d0-b5-d1-84-d0-be-d0-bd-d0-be/
GTalk-To-VoIP: шлюз между GTalk (и Windows Live Messenger) и любым телефоном, включая SIP