mo concatenation, set smsc-id

Hi, thank you for the MO concatenation in cvs!

I pondered quite some time until I noticed that
when using gsm-modem you have to set smsc-id in
config to make concatenation work. There is a check
for null in check concatenated code. As MO concatenation
is enabled by default, I guess smsc-id would be
better to be marked mandatory in the userguide and
example config files, or at least pointed to the fact..?

However, I'm still puzzled how do I get rid of
extra characters in concatenated MO messages. First
part is appended with %C3%BC and the second with
%40 (or sometimes %C3%BC or something else). Maybe
the length is calculated wrongly in AT in some place and
extra bits are taken in, or bit-conversions add padding or
something..?

Best regards,

     Petri.