Hi Jiri,
I found bug in the ser version 0.8.11pre29
File: ../modules/record.c
Function: record_route_preset
After line: 346
You forgot  to append RR_FROMTAG like this:
 
memcpy(p, RR_FROMTAG, RR_FROMTAG_LEN);
                p += RR_FROMTAG_LEN;
Best regards,
 
Kostya Khudyakov