PVS-Studio warning V512 for UCSniff

struct targets{
  char ip[MAX_ASCII_ADDR_LEN];
  u_char mac[MAX_ASCII_ADDR_LEN];
  char extension[64];
  char dirname[64];
  char protocol[11];
  char ua[48];
  char misc[64];
};

void sip_targetlookup(sipDB* currentSipCall)
{
  ...
  memcpy(targettab[targetcount].protocol,
         "sip",
         sizeof(targettab[targetcount].protocol));
  ...
}

This suspicious code was found in UCSniff project by PVS-Studio static code analyzer.
Warning message is:
V512 A call of the 'memcpy' function will lead to the '"sip"' buffer becoming out of range.  targets.c 566

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/