Deploying dial-in conferencing - PSTN gateway or IP-PBX? RRS feed

  • Question

  • I'm reading the planning documentation for Dial-in conferencing. It seems a little unclear on whether I can deploy it with just a mediation server and an IP-PBX, do I still need a PSTN gateway? I am NOT deploying enterprise voice, just PSTN conferencing. So if my PBX is IP capable, I should be set?

    What if I were using an external SIP trunking provider, would I need a PSTN gateway in that case? I'm just slightly confused as to what additional hardware I need to deploy dial-in conferencing in my environment with only a front end and edge server deployed. The mediation server shouldn't be a problem if i can collocate it on my front end.

    Wednesday, February 16, 2011 8:39 PM

All replies

  • You can deploy dial-in conferencing via any of the methods you described.  If the DID you want is already routed to your existing PBX and you have the ability to reroute that to Lync via SIP then you can definitely use that.  If you use a SIP trunk provider then you need to route that into Lync in a supported manner, either via a gateway, certified SBC, or private connection/VPN between the SIP provider and the Lync Mediation service.
    Mike Stacy | http://mikestacy.typepad.com
    Thursday, February 17, 2011 12:48 AM
  • In what scenarios do I absolutely need a media gateway?

    So if i'm understanding correctly if my PBX is capable or routing a DID with SIP to my mediation server I don't need a media gateway?

    Thursday, February 17, 2011 6:58 PM
  • Correct.  The most common requirement for a gateway is when you need to connect PRIs to Lync and don't have an intermediary platform, like a SIP PBX. 
    Mike Stacy | http://mikestacy.typepad.com
    Thursday, February 17, 2011 8:03 PM
  • Hello again,

    I've gotten ahold of my phone guys.  Our PBX is SIP capable but they would need to see how many SIP licenses the system currently has.  They also want to know if the connection/trunk from the IP-PBX to the Mediation server would count as a SIP Terminal or SIP Trunk because the system uses different licensing and programming for each. I'm assuming it's a SIP Trunk.

    When configuring my mediation server to talk directly to the IP-PBX in topology builder would I add the IP-PBX info as a PSTN gateway?  Even though technically it isn't a gateway, it's the direct endpoint of my trunk.

    Would anyone be able to shed some insight on the above?



    Tuesday, February 22, 2011 4:41 PM
  • Yes, you'd put it in as a gateway.
    Mike Stacy | http://mikestacy.typepad.com
    Wednesday, February 23, 2011 2:42 PM