concatenation and split count [cross post from users list]

Hello, Developers!

I've asked this question in users list already, but there seem to be no
answer there so far, so i'm hoping one of you would be able to shed some
light on my problem.

I'm submitting messages to Kannel and letting it do the splitting for long
(concatenated messages).
However, it is important for me to know how many messages were created (how
many split parts) - i need to write CDRs for a billing system.
And currently, all i get back from Kannel when submitting a message is "0:
Accepted for delivery."
How can i get this information?

Regards,
  Konstantin