keepalive parameter on 2.0.4b

[Andrew J Atkinson]

The default for the keepalive param in 2.0.4b is 300 although the docs. suggest
that the default is 0. Does anyone know why the default changed?

I need to change the keepalive value to 0 as I have some users connecting via
isdn and this keepalive setting will initiate an undesired phone call. 
I have 100+ users on the local LAN connecting to samba on HP-UX 11 and have not
experience any problems running with keepalive set to 300.
Will anything break if it set keepalive to 0?

Thanks in advance
-Andrew