Tansfer call directly to Exchange UM from IPPBX through OCS mediation server. RRS feed

  • Question

  • We are currently developing asterisk integration tot OCS 2007R2/ Lync 2010.


    We would like the ability to transfer directly to voicemail. Is this possible? I am thinking we need to send a diversion header or something to the mediation server which will tell it to transfer it it directly to the Exchange UM server.

    We are also looking for the best way to send a notification to EXchange UM with  EV users setup with dual forking when a call is answered by the PBX, to not send a missed clal notification.

    If a call comes in to me, and I answer it after 2 rings on my IP phone on my desk, then it will still send me the missed call notification from OCS/EXUM, because it thinks the dialing party hung up. I need a way to notify it when the call is answered on the PBX to not send the missed call notification.

    Any help with these 2 last things to work out would be greatly appreciated.



    Saturday, April 16, 2011 5:31 PM

All replies

  • Hi,

    for the first question, you have to configure a second gateway on the Exchange an configure the IP-PBX to use these gateway.

    I thing for the answer for the second question is, to diable the missed call information.


    regards Holger Technical Specialist UC
    Sunday, April 24, 2011 8:50 AM
  • For the first answer, since we are using this with OCSC/Lync, then we need to send everything over there as TLS, correct? As if we are using OCS with UM, then everything is sent using TLS. THerefore, our PBX would have to be setup to use TLS as well.

    As for the second, I didnt even think about turning the missed call notification off, but that is definitely an option. I also read in the MS-PROTOCOL documents, specifically the SIPRE document, that when we fork the call, and a phone on the IP PBX answers, we can send a 200, 303, or 605 to the mediation server and it will cancel the missed call notification. WE ar ein the process of testing that right now, but I would really like the ability to do the missed call notification if in fact, the call was actually missed.


    Here is an excerpt from the doc I referred to above:

    Document: MS-EUMR  Call Answered Event 
    When processing an audio call targeted at a user, as defined in [MS-SIPRE], if the call was answered 
    by a destination other than the registered endpoint (5) associated with the address-of-record in 
    the Request-URI header field or the simultaneous ring destination, information about the call 
    answered event MUST be sent to the UM server if the user is UM-enabled. A call is considered to be 
    answered if one of the destinations responded with a 200, 303, or 605 response code. 

    Sunday, April 24, 2011 3:58 PM
  • Hi Rick,

    How your research on the matter went finaly ? cause we are looking for the exact same setup with Lync, IPPBX and Exchange UM and are stuck on the same issue,

    Thanks in advance


    Wednesday, February 8, 2012 2:26 PM