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Lync calls only work ok one way

    Question

  • When I call a lync user from my normal phone, I can hear the lync user talking, but she cannot hear me ??
    If she calls from the LYNC client, I can hear her and she can hear me ?


    anybody any idea why this is happening?                           
    Wednesday, June 06, 2012 6:46 PM

All replies

  • Sounds like a media path issue. Is the gateway betweeen your "normal" phone and the Lync clients enabled for media bypass?
    Wednesday, June 06, 2012 6:54 PM
  • I have one machine with SBS2011 installed which has 2 nework cables connected to a CISCO asa 5505. One cable is connected for DMZ to the EDGE (which is not configured yet).

    On the SBS2011 I have 2 virtual machines running (HyperV) , one for Lync FE (Mediation, ....) , the other virtual machine is for the LYNC EDGE server.

    On the CISCO 5505 I do a PAT for my LyncFrontEndserver using ports 5060 and 5061.

    Media Bypass is enabled on the mediation server.

    Wednesday, June 06, 2012 7:06 PM
  • Well other than your configuration not being supported it seems like it should work. I would turn off media bypass and see what impact that has.
    Wednesday, June 06, 2012 7:28 PM
  • My sipprovider told me to turn it on?

    What would be a supported config , using my current sbs and virtual machines?

    Wednesday, June 06, 2012 7:34 PM
  • I turned off media bypass, same issue.

    And when I call from my cellphone the call is disconnected after 30 seconds, as if the lync does not know it is still connected

    Thursday, June 07, 2012 12:49 PM
  • When you turned off media bypass did you enable RTCPActiveCalls?
    Thursday, June 07, 2012 2:44 PM
  • I did just now and the result is the same

    Thursday, June 07, 2012 5:56 PM
  • Please also check your firewall and port configuration. You can refer to this document.


    Noya Lau

    TechNet Community Support

    Friday, June 08, 2012 9:50 AM
  • Do ports 50000 - 59999 need to be ported for this ?

    Friday, June 08, 2012 12:26 PM
  • I do notice that when I call to the LYNCuser I get a error in Wireshark saying Unknown RTP version 0 , it looks like LYNC is taking the call, but it cannot actually connect correctly or so;ething like that ?

    Good and bad call :

    Friday, June 08, 2012 2:05 PM
  • What do the CDR's say for the calls?  (I had a similar issue in the past and it ended up being the Cisco switch) 
    Friday, June 22, 2012 7:17 PM