[Asterisk-Users] 'I'nvalid extension handling problems, even with workaround

[Rich Adamson]

> > What happens on the phone is that I hear voiptalk.org's
> > greeting and after they hang up, I hear my own "invalid
> > extensions" message.
> 
> That's because your _X. extension has a 2nd line. Reduce it to
> _X.,1,Playback(invalid) and you won't have that problem.

I'm not the original poster but think I've got the same issue.
Why does reducing that to a single line solve the problem?