anchor.diff:  ipdr_log3(IpdrLog, _Start, End, SeqNum, {_Cont, [H | _]})
   		when element(1, H) > End ->
   	ipdr_log4(IpdrLog, SeqNum);
  -ipdr_log3(IpdrLog, _Start, End, SeqNum, {Cont, [H | T]})
  +ipdr_log3(IpdrLog, Start, End, SeqNum, {Cont, [H | T]})
   		when element(6, H) == stop ->
   	case ipdr_codec(H) of
   		#ipdr_wlan{} = IPDR ->
   			NewSeqNum = SeqNum + 1,
   			case disk_log:log(IpdrLog, IPDR#ipdr_wlan{seqNum = NewSeqNum}) of
   				ok ->
  -					ipdr_log3(IpdrLog, _Start, End, NewSeqNum, {Cont, T});
  +					ipdr_log3(IpdrLog, Start, End, NewSeqNum, {Cont, T});
   				{error, Reason} ->
   					Descr = lists:flatten(disk_log:format_error(Reason)),
   					Trunc = lists:sublist(Descr, length(Descr) - 1),
  
positive.code: 			NewSeqNum = SeqNum + 1,
  			case disk_log:log(IpdrLog, IPDR#ipdr_voip{seqNum = NewSeqNum}) of
  				ok ->
  					ipdr_log3(IpdrLog, _Start, End, NewSeqNum, {Cont, T});
  				{error, Reason} ->
  					Descr = lists:flatten(disk_log:format_error(Reason)),
  					Trunc = lists:sublist(Descr, length(Descr) - 1),
  
negative.code: -spec ipdr_codec(Event) -> IPDR
  	when
  		Event :: tuple(),
  		IPDR :: #ipdr_wlan{} | #ipdr_voip{} | undefined.
  %% @doc Convert `ocs_acct' log entry to IPDR log entry.
  %% @private
  ipdr_codec(Event) when size(Event) > 6,
  