/** \brief Delete NAT44 session
@param client_index - opaque cookie to identify the sender
@param context - sender context, to match reply w/ request
- @param is_in - 1 if inside network addres and port pari, 0 if outside
+ @param is_in - 1 if inside network address and port pair, 0 if outside
@param ip_address - IPv4 address
@param protocol - IP protocol
@param port - port number