Does any one recognize this binary data storage format

I am hoping someone can help me solve a bit of a puzzle.

We are working on a data file reader and extraction tool for an old
MS-DOS accounting system dating back to the mid 80's.

In the data files, the text information is stored in clearly readable
ASCII text, so I am comfortable that this file isn't EBCIDIC, however,
the some of the numbers are stored in a format that we can't seem to
recognize or unpack using the standard python tools (struct, binascii)
.... or or atleast our understanding of how these tools work !


Any assistance would be appreciated.

Here are a few examples of telephone numbers;

Exmaple 1:

Phone 1: 5616864700
Hex On Disk: C0DBA8ECF441

Phone 2: 5616885403
Hex on Disk: B0E9ADECF4F1



Another example:
Phone 1: 8003346488
Hex On Disk: 800396d0fd41

Phone2: 9544261331
Hex On Disk: F8f50ec70142

Phone3: 9544278601
Hex On Disk: 481211c70142


TIA.

.

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