Setting ignore_early_media=true has a better chance of success for T38 fax transmissions.
Setting this as a fax variable in default settings is enough for most cases where a successful transmission occurs on the first attempt. However if fax retries are needed this variable was ignored until now.
This change ensures that IF the user sets ignore_early_media=true as a default fax setting it will also be used for fax retry scenarios when T38 is enabled. If ignore_early_media is not set to true then the changes here are ignored thus minimizing risk.
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