Looked in the code and the flags are resync'ed on t_relay() (or the similar relay functions), that happens because of:

• https://github.com/kamailio/kamailio/blob/master/src/modules/tm/t_lookup.c#L1327

And t_newtran() is executed inside t_relay_to():

• https://github.com/kamailio/kamailio/blob/master/src/modules/tm/t_funcs.c#L241

The behaviour is coming via SER project, based on the comments there.

I am going to add the same for xflags.

On the other hand, the t_flush_flags() might still be useful for the case when the transaction is created, but not forwarded (e.g., local handling or, even I haven't checked the code, could be the case of suspending the transaction), so I am going to keep the functions, but document that they are not needed if the transaction is forwarded with t_relay() or similar functions.

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