asterisk users - Nov 2008 - length of field names

I had two definitions in sip.conf like:

[geishp64_to_mpgeisjhome1]
username=geishp64_to_mpgeisjhome1
secret=26 characters long
host=x.y.z.1

[geishp64_to_mpgeisjhome2]
username=geishp64_to_mpgeisjhome2
secret=26 characters long
host=x.y.z.1

When I had BOTH of the above defines in sip.conf seems like 1.4.21 was 
getting confused
on which one to use. auth didnt match was there error I saw. However, if 
I remove the second entry everything
works as expected. (but I do want two, or more entries for testing).

Is there a name length limit on username, secret or [X]?

Is it an issue that both connections are to the same IP address or host 
or are my names to long?

I thought everything was 256?

Thanks,

Jerry