From SwyxWare v6.12 on it is possible to manipulate the name of the tranrecording file. The following explains it:

For special purpose it is possible to change the file name layout by adding a registration key:

Add a new value of type "String" with the name "CallRecordingFilenameFormat" to

HKEY_LOCAL_MACHINE\SOFTWARE\Swyx\IpPbxSrv\CurrentVersion\Options

The format string may contain one or more of the following place holders

[internaladdresscanonical]                    the internal address in canonical number format (if available)
[internaladdress]                                 the internal address
[remoteaddresscanonical]                     the remote address in canonical number format (if available)
[remoteaddress]                                  the remote address
[remotename]                                     the remote name
[calldirection]                                      the direction of the call (In/Out)
[callid]                                                the call id as of the corosponding CDR record
[date]                                                 the date of the call in the format "yymmdd", e.g. 080102 for 2 Jan 2008
[time]                                                 the time of the call in the format "hhmmss", e.g. 070809

The default format is "[calldirection]#[internaladdress]#[remotename]#[remoteaddress]#[date]#[time]" which will create the same filename as original implementation.