Delays in establishing conferences RRS feed

  • Question

  • What are the acceptable times for establishing a conference and then the audio being connected? We have the following scenario:

    User A calls User B using either a Lync phone device or the client

    User A then invites User C to the conference

    We have a delay of 3 to 4 seconds before User C's phone rings and then when User C answers, the phone device displays 'connecting' for 3 to 4 seconds before User C can participate

    This delay in connecting is an issue as our users will answer the phone and start speaking, only to realise that no-one can hear them!

    Is there a method of reducing this delay, or is this normal and to be expected?

    We are using Polycom CX600 phones with the latest firmware release and roll-up 3 has been applied to our clients & server. 




    Thursday, October 6, 2011 10:45 AM

All replies

  • HI,

    let me  get the problem straight. you call User B from a device (CX600) or lYNC client and start a conversation. Then you decide to add another user (C) to the call as a conference. The problem that you face is that it take 3-4 seconds to ring the User C.

    Actually this is how it functions. Unlike Standard PBX, LYNC first establish the conference and then it call the user.Once the conference is sets up, if you get another person (User D) to join to the call, the User D will get the ring instantly since the Conference is already there.

    This is not an issue but this is how it functions.


    Thursday, October 6, 2011 10:57 AM
  • Hi,

    thanks for the reply. I did simplify the scenario for clarity but Users A and B are already in a conference and we still experience the delay in establishing the connection to the user's phone and in the voice connecting.



    Monday, October 10, 2011 11:27 AM
  • can you try the "Meet now" option and try connecting couple of users and see whether you still get the same problem.


    Monday, October 10, 2011 12:16 PM
  • Hi Julian,

    There are many factors which might impact call setup and introduce delays. Some of the things that you can look for are:

    1. The number once cause for delayed call setups s a misconfigured Edge server, make sure that MRAS on your edge is working properly. (Test a call from an internal Lync client to an external Lync client across edge server, does the call work? does the setup take time?)
    2. There were some issues which were fixed via patches (see KB2517739), please ensure you have the latest updates installed
    3. Misconfigured HLBs have also introduced delays in some of the cases.
    4. Virtualization: In some cases it has been down to the fact that the Lync server did not have dedicated loads when running under virtualization and added additional delays.

    The best way forward in my opinion would be for you to capture network captures and see at what stage is the delay getting added to the call setup process.

    • Proposed as answer by Akshat N Thursday, November 3, 2011 7:40 AM
    Thursday, November 3, 2011 7:40 AM