[OpenSIPS-Devel] [OpenSIPS/opensips] 30214d: Fix CANCEL matching in B2B stack

[Bogdan Andrei IANCU]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 30214dc2f968410f47457a07e2aeb383924c914d
      https://github.com/OpenSIPS/opensips/commit/30214dc2f968410f47457a07e2aeb383924c914d
  Author: Bogdan-Andrei Iancu <bogdan at opensips.org>
  Date:   2022-08-16 (Tue, 16 Aug 2022)

  Changed paths:
    M modules/b2b_entities/dlg.c
    M modules/tm/t_lookup.c

  Log Message:
  -----------
  Fix CANCEL matching in B2B stack

Instead of attempting a dialog level matching (callid and tags), do a proper incoming CANCEL matching at transaction level.
This fixes scenarios where the B2B handles several branches of a call that was forked by an ahead proxy.
Many thanks to Denys Pozniak for reporting