The OBi and OBiTalk utilize Google Voice and you will need to whitelist the following domains to ensure our service works with your OBi service :
Allow Google Chat
xmpp-server.l.google.com
chatenabled.mail.google.com
talkgadget.google.com
talk.google.com
talks.l.google.com
l.google.com
Allow Google Talk
talkx.l.google.com
talk.l.google.com
talk.google.com
