[OpenSIPS-Devel] [OpenSIPS/opensips] fba194: add detailed documentation for call recording

[Razvan Crainea]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: fba1941f3a84eee6a2f607679ae26fe3e12281ac
      https://github.com/OpenSIPS/opensips/commit/fba1941f3a84eee6a2f607679ae26fe3e12281ac
  Author: Razvan Crainea <razvan at opensips.org>
  Date:   2017-03-14 (Tue, 14 Mar 2017)

  Changed paths:
    M modules/rtpengine/README
    M modules/rtpengine/doc/rtpengine_admin.xml
    M modules/rtpengine/rtpengine.c

  Log Message:
  -----------
  add detailed documentation for call recording

Credits go to Eric Tamme for documenting and testing.
Closes #942