Skip adding preflow on transfers #6726
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When transferring a call, don't prepend a preflow. Previously, preflows were prepended to all callflows when present. If a preflow defined a TTS like "Welcome to Company X", the caller would hear the TTS on call connection and, if transferred to a parking slot via *31 (for instance), would hear the preflow TTS again before hearing hold music. Backport of 2600hz/kazoo-callflow#77
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When transferring a call, don't prepend a preflow.
Previously, preflows were prepended to all callflows when present. If
a preflow defined a TTS like "Welcome to Company X", the caller would
hear the TTS on call connection and, if transferred to a parking slot
via *31 (for instance), would hear the preflow TTS again before
hearing hold music.
Backport of https://github.com/2600hz/kazoo-callflow/pull/77