The function lookup_to_dset() is a config command implemented inside the registrar module.

https://github.com/kamailio/kamailio/blob/351efd29d332703e79104a106ade08c9d1df6e20/src/modules/registrar/registrar.c#L183

As you can see from the link above, It triggers w_lookup_to_dset() and it ends up calling lookup_helper() with the mode flag set to zero that causes lookup_helper() to not overwrite the request uri (and destination uri if it's the case).

For me it's worth documenting lookup_to_dset() inside modules/registrar/README file, this function it was very useful to me and I found out about it only digging into the code.

Thanks

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