I have two seperate CUPS clusters both running 8.5(2), europe.company.com and usa.company.com.
I can't figure out what I'm supposed to do to let CUPC users in europe cluster chat with users in usa cluster.
Is this called a Interdoman Federation?
http://www.cisco.com/en/US/docs/voice_ip_comm/cups/8_0/english/integration_notes/Federation/CUPConfig_chapter.html#wp1077564