Send the following on WhatsApp
Continue to ChatMicrosoft and RADVISION Sign Licensing Agreement to Provide Live Communications Server-Compatible SIP Toolkits https://peterdehaas.net/2006/03/microsoft_and_r.html
Microsoft and RADVISION Sign Licensing Agreement to Provide Live Communications Server-Compatible SIP Toolkits https://peterdehaas.net/2006/03/microsoft_and_r.html