Mobile Client makthe call to PSTN but the call not connect RRS feed

  • Question

  • Hello, we have a S4B implementation full on-premises, windows pc client connect and do call to the pstn ok, but the mobile client connect ok too, dial a pstn number, the receptor phone ring, but when pickup the call, not audio is transmitted and the call is dropped.

    Any ideas to resolve this?


    Monday, May 2, 2016 11:36 AM


  • Hi,

    Did the issue also happen with external desktop client?

    If the issue also happen with external desktop client, then the issue may related with Edge Server, make sure Edge Server all services started, and external interface 50,000-59,999 , TCP\UDP 3478 open.

    If the issue only happen with mobility client, then try to restart IIS UCWA service and then test again.

    Best Regards

    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    Eason Huang
    TechNet Community Support

    • Proposed as answer by Eason Huang Thursday, May 12, 2016 2:48 PM
    • Marked as answer by Eason Huang Sunday, May 15, 2016 11:59 AM
    Thursday, May 5, 2016 9:53 AM