asterisk users - Oct 2004 - uniqueid - how unique it is

Hello,

a.. uniqueid: Unique Channel Identifier (32 characters)

I would like to know how is the unequeId constructed. ?

I need a primary key in cdr database and would like to know whether I can
make uniqueid the primary key.  If asterisk channel does not have any idea
of previousely crated ID's and if this id is randomly crated number then
there is a chance that unequeid get a duplicate entry.

thanks

SW

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