Hi!

I'm using subst_hf to add some extra info to contact

subst_hf("Contact", "/^(.*)sip:(.*)@(.*)$/\1sip:encei$var(extra_info)-\2@\3/i", "f");

With combination of topos it's giving me strange results like

2(26) WARNING: sanity [sanity.c:282]: check_ruri_scheme(): failed to parse request uri [sip:encei302e3734-btpsh-5c6c00ac-2e-f@172.28.0.74><sip:encei302e3734-btpsh-5c6c00ac-2e-f@172.28.0.74]

Seems, it's doubling R-URI on in-dialog requests. If I'm disabling topos - all is ok.

What is interesting - this can't be reproduced with remove_hf/append_hf mechanisms.
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