problem with dissector_add function..

I have to design a dissector for core to core messages. In the code, inside the proto_ reg_ handoff_ccm() function,

dissector_ handle_ t ccm_ handle;

ccm_ handle=new_ create_ dissector_ handle(dissect_ ccm, proto_ ccm);

dissector_ add(...............................................);

I have a problem in writing this third line. There are three options;

1. dissector_ add("wtap_ encap", WTAP_ ENCAP_ CCM, ccm_ handle);
2. dissector_ add(" ", NULL, ccm_ handle);

What should I use?? Or if I am completely mistaken and I have to rather write something completely different..

please reply,

Thanks and Regards, Sid