UML23 — UML 2.3 draft, 11.3.1 - AcceptCallAction

The text of the description is contradictory. The first sentence says:

“AcceptCallAction is an accept event action representing the receipt of a synchronous call request. ....”

In the second paragraph it says:

This action is for synchronous calls. If it is used to handle an asynchronous call, execution of the subsequent reply action will complete immediately with no effects.

Although the description states twice that it is for the receipt of synchronous calls it then goes on to describe its use for asynchronous calls.

Accept call actions are intended to receive synchronous calls, however they will, indeed, also accept asynchronous calls, but, as already noted in the spec, no reply will be sent in such cases. The description could be better worded to make this clear without sounding contradictory.