OCS 2007 and Cisco Call Manager 6.1 - How to integrate? RRS feed

  • Question

  • Hey everyone,

    I am trying to find some sort of documentation or a how-to to integrate OCS with CCM. We have a VoIP infrastructure and I am trying to enable Office Communicator to be able to call outside phone numbers using the Cisco VoIP lines we have.

    Does anyone have an insight on this? can it be done without a "hardware based" gateway?



    Thursday, July 17, 2008 12:37 AM

All replies

  • For enterprise voice (using Communicator as a softphone) you must have a gateway.  If you just want remote call control (Communicator controlling your desk phone) then you can just use CUPS for CCM.  For a list of supported gateways take a look at http://technet.microsoft.com/en-us/office/bb735838.aspx.
    Thursday, July 17, 2008 1:54 AM
  • Hi,


    For "old" traditional PBX you need a gateway (Dialogic, Audiocodes,...) but with CCM you can do direct SIP integration since 5.1 (even if it's maybe not supported by Cisco or/and MS, it works). You will still need a Mediation Server installed on another server to make link between OCS and CCM.

    You can read these docs to better understand MS telephony point of view:






    Thursday, July 17, 2008 11:09 AM
  • How do you solve the problem of cropping "+" sign from numbers if calling OCS -> PSTN via CCM?

    The opposite direction may not be a problem, because if CCM does not provide the leading "+" sign, mediation can put it before the numbers if calling from PSTN -> OCS via CCM.

    But as my experience, calls from OCS -> PSTN will fail, because CCM does not understand the "+" prefix, and will drop the call.
    Tuesday, July 22, 2008 11:29 AM
  • Guess what. You just found the reason it isnt supported. There are workarounds available like changing the amount of incoming digits into your SIP trunk on CCM to remove the + but this is limiting and you wont be able to support 911 or international dialing with out some major tinkering with normalization rules. There are also other issues like the use of MTPs that may cause issues as well if you choose to use Callamanger MTPs and not IOS enhanced like that in an ISR. To work around this issue you can use a Cisco ISR configured as an IP-IP GW between the two enviroments. The thread below has all the information you will need to set that up as well as more info on direct trunking if you want to stay with that direction.






    Tuesday, July 22, 2008 2:14 PM