locked
Lync phone to Exchange UM Traffic Flow RRS feed

  • Question

  • We're trying to figure out where to place our Exchange UM servers in our WAN.  When a phone calls voicemail it looks like the traffic is coming from the Pool Server to the Exchange UM Server?  Once the call is setup does the pool server drop off and the phone talks directly to Exchange UM?  Also is it RTAudio and is CAC throttling this?

    This is for an internal phone call.

    Thanks,

    Jobe

    Thursday, March 1, 2012 6:45 PM

Answers

  • Hello Jobe,

    From the decription: Your UM server is across the WAN in the HQ

    When a Lync client homed on SBA/SBS calls any user and the user is unavailable and enabled for UM, the EXUMrouting component on the SBA will try to route the invite to the UM server associated with the user's dial plan. The SIP signalling will be from the SBA to the Exchange UM. The media flow will be from Lync endpoint to the Exchange UM server.

    If you have UM server across the WAN and the WAN goes down then you can configure voice mail reroute so that the calls to UM can be re routed through PSTN.

    You can refer to http://technet.microsoft.com/en-us/library/gg398606.aspx and http://technet.microsoft.com/en-us/library/gg412948.aspx 

    THe codec used is RTAudio and Exchange UM calls are not affected by CAC, CAC only works for Lync endpoints and servers

    • Marked as answer by Jobe.Gates Wednesday, March 7, 2012 1:09 PM
    Wednesday, March 7, 2012 9:19 AM
  • Hello Jobe,

    Since CAC wont apply to calls made to Exchange UM, you can calculate BW usage for worst case scenario.

    Say for e.g. the branch site has 100 users and the maximum calls the user can make is 100--say 100 calls to 100 users and all the recipient of the call are busy or not available so all the calls will be routed to voice mail and since we use RTAudio and say use 50 kbps per call so for 100 calls we would use 5 mb of traffic across the WAN link.

    Now such a scenario will be rare.. Hope this helps!

    • Marked as answer by Jobe.Gates Thursday, March 8, 2012 8:46 PM
    Thursday, March 8, 2012 11:22 AM

All replies

  • Hi,

    When ever a user calls voicemail it will obviously go through the lync because the gateway which you are using is not directly connected to the UM and lync is in between the lync client or hand sets and um servers.

    Which voice gateway are you using. how many different networks and different Lync sites are you using. have more information on CAC http://technet.microsoft.com/en-us/library/ff731056.aspx which explains how cac works between two sites. http://technet.microsoft.com/en-us/library/gg398529.aspx 

    Hope above helps


    If answer is helpful, please hit the green arrow on the left, or mark as answer. Salahuddin | Blogs:http://salahuddinkhatri.wordpress.com | MCITP Microsoft Lync

    Thursday, March 1, 2012 8:40 PM
  • I wasn't sure if it would do media bypass?  So if I'm at a remote site here's the flow Lync Phone ->SBA/SBS -> Exchange UM? or Lync Phone -> SBA/SBS -> FE Pool at HQ --> Exchange UM?

    Right now my Exchange UM is at my HQ.

    Thanks,

    Jobe


    • Edited by Jobe.Gates Thursday, March 1, 2012 9:52 PM
    Thursday, March 1, 2012 9:52 PM
  • Hi,

    Here are some posts for your information. As per Microsoft http://technet.microsoft.com/en-us/library/gg413028.aspx 

    http://technet.microsoft.com/en-us/library/gg398703.aspx and http://theucguy.wordpress.com/2010/09/14/microsoft-lync-server-2010-media-bypass/ . have you enabled media by pass and cac or not is it enabled globally.


    If answer is helpful, please hit the green arrow on the left, or mark as answer. Salahuddin | Blogs:http://salahuddinkhatri.wordpress.com | MCITP Microsoft Lync

    Thursday, March 1, 2012 11:18 PM
  • Hello Jobe,

    From the decription: Your UM server is across the WAN in the HQ

    When a Lync client homed on SBA/SBS calls any user and the user is unavailable and enabled for UM, the EXUMrouting component on the SBA will try to route the invite to the UM server associated with the user's dial plan. The SIP signalling will be from the SBA to the Exchange UM. The media flow will be from Lync endpoint to the Exchange UM server.

    If you have UM server across the WAN and the WAN goes down then you can configure voice mail reroute so that the calls to UM can be re routed through PSTN.

    You can refer to http://technet.microsoft.com/en-us/library/gg398606.aspx and http://technet.microsoft.com/en-us/library/gg412948.aspx 

    THe codec used is RTAudio and Exchange UM calls are not affected by CAC, CAC only works for Lync endpoints and servers

    • Marked as answer by Jobe.Gates Wednesday, March 7, 2012 1:09 PM
    Wednesday, March 7, 2012 9:19 AM
  • Thank you Jimmy this is exactly what I was looking for!  Since you can't use CAC how do you control RT Audio?  I mean is how do you plan bandwidth or do you just do worst case?

    Thanks,

    Jobe

    Wednesday, March 7, 2012 1:15 PM
  • Hello Jobe,

    Since CAC wont apply to calls made to Exchange UM, you can calculate BW usage for worst case scenario.

    Say for e.g. the branch site has 100 users and the maximum calls the user can make is 100--say 100 calls to 100 users and all the recipient of the call are busy or not available so all the calls will be routed to voice mail and since we use RTAudio and say use 50 kbps per call so for 100 calls we would use 5 mb of traffic across the WAN link.

    Now such a scenario will be rare.. Hope this helps!

    • Marked as answer by Jobe.Gates Thursday, March 8, 2012 8:46 PM
    Thursday, March 8, 2012 11:22 AM
  • Thanks Jimmy again exactly what I was looking for.

    Thanks,

    Jobe

    Thursday, March 8, 2012 8:46 PM