[OpenSIPS-Devel] [OpenSIPS/opensips] b2fdee: dialog API: Clarify documentation for DLGCB_FAILED

[Liviu Chircu]

  Branch: refs/heads/3.1
  Home:   https://github.com/OpenSIPS/opensips
  Commit: b2fdeed8ea9fc28b2537308eb0cbc63e051a08d6
      https://github.com/OpenSIPS/opensips/commit/b2fdeed8ea9fc28b2537308eb0cbc63e051a08d6
  Author: Liviu Chircu <liviu at opensips.org>
  Date:   2020-06-24 (Wed, 24 Jun 2020)

  Changed paths:
    M modules/dialog/dlg_cb.h
    M modules/dialog/dlg_handlers.c

  Log Message:
  -----------
  dialog API: Clarify documentation for DLGCB_FAILED

The DLGCB_FAILED callback is subject to the "200 OK" vs. "408 timeout"
SIP race condition during dialog establishment and developers should use
it with extra caution :)

(cherry picked from commit 1f2c8c4854f9494ff7b712be3dc1eba87cba57f7)