Custom messages, tags, values. How about Custom BeginString?

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Imported from previous forum

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Has anybody come across a BeginString which is not a standard BeginString like FIX.m.n or FIX.m.nxxx or FIXT.p.q ? If I remember correctly I once came across a FIX log of communication between a FIX engine and its Trading application (I would prefer not to name the FIX Engine / trading application both of which are from the same vendor) the messages of this log started like 8=FIX.IPC^ and had crazy tag numbers which matched none from the FPL’s FIX specs.

Regards,
K. Mahesh

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[ original email was from John Greenan - john.greenan@alignment-systems.com ]
Yes. I’ve seen this with some custom implementations of FIX links between an equity based OMS and a fixed income trading platform. Since the version of FIX used was neither 4.2 nor 4.4 the OMS vendor used the name of the fixed income platform as BeginString.

Has anybody come across a BeginString which is not a standard BeginString like FIX.m.n or FIX.m.nxxx or FIXT.p.q ? If I remember correctly I once came across a FIX log of communication between a FIX engine and its Trading application (I would prefer not to name the FIX Engine / trading application both of which are from the same vendor) the messages of this log started like 8=FIX.IPC^ and had crazy tag numbers which matched none from the FPL’s FIX specs.

Regards,
K. Mahesh