Lync 2010 + Edge + CAC Issue RRS feed

  • Question

  • We had this infrastructure:

    PSTN/NGN <> SBC <> Mediations <> FrontEnd (CAC is enabled, SIP trunk exists, audio alternative path is disabled)

    We've added a edge. We have only a región.

    External users can't call to internal users   >> bandwitdh is insuficcient message... >> So, CAC issues

    1) If I enabled "audio alternative path", it Works..... What is the reason ??

    2) Is that necessary ??

    3) Any impact with 1) ??
    • Edited by Rivers75 Wednesday, August 13, 2014 11:48 AM
    Wednesday, August 13, 2014 11:42 AM


  • This is "working by design" but poorly documented.  If you uncheck the boxes "Enable audio alternative path" or "Enable video alternative path" under Network Configuration | Regions you essentially make your edge servers unable to pass media through them.

    What this box is saying is, if you had multiple edge servers in Site A and Site B and CAC stopped a audio/video call from going over the WAN, we are going to allow the call to setup over the internet by going out Site A internet to Site B.

    Again, by design, but should be documented.



    Richard Brynteson, Lync MVP | http://masteringlync.com | http://lyncvalidator.com

    • Proposed as answer by Lisa.zheng Thursday, August 14, 2014 7:38 AM
    • Marked as answer by Rivers75 Friday, August 15, 2014 6:35 AM
    Wednesday, August 13, 2014 8:12 PM