I have my lcs2005 system up and running. all domains have been working fine. we have an international office that added a domain international and built a trust to our forest root home.com. we have our lCS 2005 server in corporate.home.com domain. THe international group have machines that they have added to this international.home.com domain but are attempting to log on with regular credentials (i.e. userid@corporate.com and corporate\userid). this has worked on other domains they added but this new one is not. driving me crazy. i've gone thru this kb article trying to identify the culprit but none are valid: http://support.microsoft.com/kb/830539

What am i missing??????

i hae done an nslookup and here are the results:
c:\>nslookup corporate.home.com
Server: LoksDOH.doh.home.com
Address: 99.77.19.11

Non-authoritative answer:
Name: corporate.home.com
Addresses: 99.999.178.22, 99.999.178.23, 99.255.0.27, 99.24.233.88
99.32.235.0, 99.32.235.108, 99.32.235.117, 99.32.235.170, 99.33.88.199

99.41.1.116, 99.777.187.225, 99.777.187.226, 99.777.254.207, 99.999.16
1.255
99.999.178.21

c:\>nslookup
Default Server: LoksDOH.doh.home.com
Address: 99.77.19.11

> set type=srv
> _sip._tcp.corporate.home.com
Server: LoksDOH.doh.home.com
Address: 99.77.19.11

Non-authoritative answer:
_sip._tcp.corporate.home.com SRV service location:
priority = 0
weight = 0
port = 5060
svr hostname = lcs.home.com

lcs.home.com internet address = 99.999.444.666
> _sipinternal._tcp.corporate.home.com
Server: LoksDOH.doh.home.com
Address: 99.77.19.11

Non-authoritative answer:
_sipinternal._tcp.corporate.home.com SRV service location:
priority = 0
weight = 0
port = 5060
svr hostname = lcs.home.com

com nameserver = j.gtld-servers.net
com nameserver = k.gtld-servers.net
com nameserver = l.gtld-servers.net
com nameserver = m.gtld-servers.net
com nameserver = a.gtld-servers.net
com nameserver = b.gtld-servers.net
com nameserver = c.gtld-servers.net
com nameserver = d.gtld-servers.net
com nameserver = e.gtld-servers.net
com nameserver = f.gtld-servers.net
com nameserver = g.gtld-servers.net
com nameserver = h.gtld-servers.net
com nameserver = i.gtld-servers.net
lcs.home.com internet address = 99.999.444.666
a.gtld-servers.net internet address = 192.5.6.30
a.gtld-servers.net AAAA IPv6 address = 2001:503:a83e::2:30
> _sipinternaltls._tcp.corporate.home.com
Server: LoksDOH.doh.home.com
Address: 99.77.19.11

Non-authoritative answer:
_sipinternaltls._tcp.corporate.home.com SRV service location:
priority = 0
weight = 0
port = 5061
svr hostname = lcs.home.com

com nameserver = m.gtld-servers.net
com nameserver = a.gtld-servers.net
com nameserver = b.gtld-servers.net
com nameserver = c.gtld-servers.net
com nameserver = d.gtld-servers.net
com nameserver = e.gtld-servers.net
com nameserver = f.gtld-servers.net
com nameserver = g.gtld-servers.net
com nameserver = h.gtld-servers.net
com nameserver = i.gtld-servers.net
com nameserver = j.gtld-servers.net
com nameserver = k.gtld-servers.net
com nameserver = l.gtld-servers.net
lcs.home.com internet address = 99.999.444.666
a.gtld-servers.net internet address = 192.5.6.30
a.gtld-servers.net AAAA IPv6 address = 2001:503:a83e::2:30
> _sip._tls.corporate.home.com
Server: LoksDOH.doh.home.com
Address: 99.77.19.11

Non-authoritative answer:
_sip._tls.corporate.home.com SRV service location:
priority = 0
weight = 0
port = 5061
svr hostname = lcs.home.com

lcs.home.com internet address = 99.999.444.666
>