Hello,
I ran in to the same issue where set_contact_alias were applied in some cases and in some cases not. I nailed it down to be related to having GRUU support enabled in the registrar.

Originally I had the configuration:
modparam("registrar", "gruu_enabled", 1)

Disabling GRUU made it work as I expected:
modparam("registrar", "gruu_enabled", 0)

This may be expected behaviour but in my case I tried to figure out why it in some cases did apply the alias and in other cases not. Maybe this will save someone else a few hours of confusion and frustration...

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