Re: [Quickfix-developers] Question regarding Values of BeginString

Hi,

Starting with FIX5.0 the transport layer FIXT1.1 was used as BeginString. Using this, you could send application messages in different FIX versions via the same FIX session. That would be specified by tag (Default)ApplVerID.

Hope that helps.
Cheers
Chris

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Christoph John
Software Engineering

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Sent: 23 February 2026 22:44
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Subject: [Quickfix-developers] Question regarding Values of BeginString

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QuickFIX Documentation: http://www.quickfixengine.org/quickfix/doc/html/

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