Public Im Connectivity and Federation with MSN, Yahoo and AOL

Hi... i install lcs 2005 sp1 standar. i have an acces proxy
and enabling PIC..
ok.. in my internal network my domain have a domain.internal dns name
and my external dns name is a domain.com. the clients sip direcction when i enable any accounts. its created with sip:useraname@domain.internal and when they try to connect internally, the connection is ok.. and after of configure the external edg and review is everything is ok. i try to connect with username@domain.com and not work. but if i try with username@domain.internal is work.. and other issue that i have is that i don´t view the federation with msn aol and yahoo, because when i add to my contacts any example@hotmail.com , the status is unknown.
any one can help me with this..??

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