I suggest you to configure one 8961 with BLF/SD using the web interface, then export phones all details and verify which parameters have been setted to the phone you just configured. Now You should delete from the file all the phones which are not interested to this configuration and you can add or modify all other 8961 with the blf/sd informations in the same file and import It using:"phones -> insert phones -> Insert Phones All Details with check override the existing conf" be careful because you will overwrite all parameters of these phones, try the import on one phone, If everything good do the bulk for all.
Hope this will help you !!