I do believe so.
/* Get the Implementation ID, which is a String and looks like G/N, where G is the Global Call ID, and the N is...well...actually, I cannot think of what it is at the moment, but it's not needed ;) */
impl = Get Contact Info (Implementation ID)
/* Strip off that bit at the end that I don't know what it is */
If (impl != null && impl.trim() != "")
True
/* Strip off last two characters */
Set impl = impl.substring(0, impl.length() - 2)
/* Use the Set Enterprise Info step to send to Finesse */
Set Enterprise Info ("user.global_callid" = impl)
False
/* Can't do anything with a bad value */