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Utilising Lync for enterprise voice RRS feed

  • Question

  • Hi

    I've heard about using Lync 2010 Server for Enterprise voice and have been carrying out some reading on the topic. Before I approached the rest of the IT team at my company, I had some questions if someone could help.

    From what I understand, to use Lync for voice we'll need to:

    i. Enable Lync users for Enterprise Voice via the Lync Control Panel
    ii. Assign Voice Policy (comprised of PSTN Usage policies) to each user
    iii. We should also look at Dial Plans for 'normalization'

    Also, in terms of the infrastructure am I right in thinking:

    Lync client > Lync Front End > Media Gateway > PBX ---------INTERNET

    The questions I had were:

    a) I've heard a Mediation server is no longer required as much as in OCS as the Lync client encodes the data better now, is this true?

    b) Could someone explain in layman's terms what a SIP trunk is, I'm still not understanding that concept

    c) How does the Lync FE talk to the Media GAteway? Where is this configured on the FE/ LCP?

    d) From the PBX, where does the data go?

    e) If the call is between internal Lync users, I assume that the traffic does not go past the FE?
    Saturday, September 8, 2012 10:27 PM

Answers

  • a) I've heard a Mediation server is no longer required as much as in OCS as the Lync client encodes the data better now, is this true?

    Lync calls by default peer to peer calls. The Mediation Server will be used for calls from a Gateway or also from a Sip Provider which will not suport media Bypass.

    b) Could someone explain in layman's terms what a SIP trunk is, I'm still not understanding that concept

    A sip trunk is a VoIP Connection to a PSTN Provider to make outside calls to other companies with a legacy PBX.

    It is the same like a ISDN PSTN Connection from a legacy PBX for Voice calls.

    c) How does the Lync FE talk to the Media GAteway? Where is this configured on the FE/ LCP?

    All configuration will be done on the Lync FE Server via Web control pannel or powershell and the sip control will be done via the FE Server.

    d) From the PBX, where does the data go?

    Via Gateway or direct SIP directly to the Lync Client or through the Mediation Server if media Bypass is not supported.

    e) If the call is between internal Lync users, I assume that the traffic does not go past the FE?

    only the sip controll will go through the FE if no mediation Server is used. Conferences will be always hosted through the FE


    regards Holger Technical Specialist UC

    • Marked as answer by Kent-Huang Tuesday, September 25, 2012 1:28 AM
    Sunday, September 9, 2012 1:49 PM
  • Normal you will use your existing Connection because of using the same Company phone number.

    A SIP trunk is a new additional Option to use but not necessarry.

    You can use the PSTN Gateway also without an existing PBX.

    Lync client > Lync Front End > Media Gateway > PBX > PSTN Gateway ---------PSTN Network

    Yes this will be the call path if no media Bypass is used. With media bypass

    Lync client > Media Gateway > PBX > PSTN Gateway ---------PSTN Network

    or without PBX and a certified PSTN gateway

    Lync client > Media Gateway >  ---------PSTN Network

    If both companies using Lync it is possible to make voice calls directly over the Internet breakout.


    regards Holger Technical Specialist UC

    • Marked as answer by Kent-Huang Tuesday, September 25, 2012 1:31 AM
    Sunday, September 9, 2012 2:14 PM
  • Hi,

    The options you listed are correct. For option 2, you can use direct sip connections to connect Lync Server to either an IP-PBX or a PSTN gateway. For details:

    http://technet.microsoft.com/en-us/library/gg398151.aspx

    If you choose to connect PBX infrastructure, ken's blog will help you to understand the migration more clearly.

    http://ucken.blogspot.com/2011/11/migrating-pbx-users-to-lync-enterprise.html


    Regards,

    Kent Huang

    TechNet Community Support ************************************************************************************************************************ Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question.


    • Edited by Kent-Huang Monday, September 10, 2012 7:19 AM
    • Marked as answer by Kent-Huang Tuesday, September 25, 2012 1:31 AM
    Monday, September 10, 2012 7:19 AM

All replies

  • here are your answers;

    a. mediation server is still required, however because of media by pass facility we can actually off load some of the load from mediation server.

    b. SIP is an alternate to the digital lines called PRI, it can be either from an IP PBX (cisco, avaya) or from internet telephony service provider

    c. media gateway is not configured in control panel, its is configured through topology builder, however in pstn usage one should select appropriate gateway to send out the call

    d. from the PBX the call with go to your PSTN, PBX is connected to PSTN either through analog line or digital

    e. for an internal call the media traffic does not go through FE because media is always peer to peer where possible, however the entire signalling will still happen through FE

    • Proposed as answer by tanveer.ahmad Sunday, September 9, 2012 1:47 PM
    Sunday, September 9, 2012 1:47 PM
  • a) I've heard a Mediation server is no longer required as much as in OCS as the Lync client encodes the data better now, is this true?

    Lync calls by default peer to peer calls. The Mediation Server will be used for calls from a Gateway or also from a Sip Provider which will not suport media Bypass.

    b) Could someone explain in layman's terms what a SIP trunk is, I'm still not understanding that concept

    A sip trunk is a VoIP Connection to a PSTN Provider to make outside calls to other companies with a legacy PBX.

    It is the same like a ISDN PSTN Connection from a legacy PBX for Voice calls.

    c) How does the Lync FE talk to the Media GAteway? Where is this configured on the FE/ LCP?

    All configuration will be done on the Lync FE Server via Web control pannel or powershell and the sip control will be done via the FE Server.

    d) From the PBX, where does the data go?

    Via Gateway or direct SIP directly to the Lync Client or through the Mediation Server if media Bypass is not supported.

    e) If the call is between internal Lync users, I assume that the traffic does not go past the FE?

    only the sip controll will go through the FE if no mediation Server is used. Conferences will be always hosted through the FE


    regards Holger Technical Specialist UC

    • Marked as answer by Kent-Huang Tuesday, September 25, 2012 1:28 AM
    Sunday, September 9, 2012 1:49 PM
  • Thanks for the replies.

    Am I correct, then, in saying that the true path is this:

    Lync client > Lync Front End > Media Gateway > PBX > PSTN Gateway ---------PSTN Network

    Also, regarding SIP trunks, does every company need s SIP trunk to a VOIP provider? How else would would they make the calls to external companies? Or is an internal PBX/PSTN Gateway the other solution?

    Sunday, September 9, 2012 2:02 PM
  • Normal you will use your existing Connection because of using the same Company phone number.

    A SIP trunk is a new additional Option to use but not necessarry.

    You can use the PSTN Gateway also without an existing PBX.

    Lync client > Lync Front End > Media Gateway > PBX > PSTN Gateway ---------PSTN Network

    Yes this will be the call path if no media Bypass is used. With media bypass

    Lync client > Media Gateway > PBX > PSTN Gateway ---------PSTN Network

    or without PBX and a certified PSTN gateway

    Lync client > Media Gateway >  ---------PSTN Network

    If both companies using Lync it is possible to make voice calls directly over the Internet breakout.


    regards Holger Technical Specialist UC

    • Marked as answer by Kent-Huang Tuesday, September 25, 2012 1:31 AM
    Sunday, September 9, 2012 2:14 PM
  • Thanks Holger, what's the benefit of using a SIP trunk?
    Sunday, September 9, 2012 2:45 PM
  • if you are using a sip trunk from a certified ITSP you no longer require a gateway. 

    but i still doubt the statement from Holger, mediation server is still required if you want to run enterprise voice.

    Sunday, September 9, 2012 3:22 PM
  • From my prospective, there is no benefit of a sip trunk.

    Only for clarify a mediation server is always needed for a SIP trunk and normal for a Enterprise voice deployment. If you use media Bypass the mediation server can be co-located installed


    regards Holger Technical Specialist UC

    Sunday, September 9, 2012 4:33 PM
  • Thanks, so basically the options are:

    i SIP trunk to an IT Service Provider

    ii. PBX > PSTN Gateway set up on the company network

    Am I correct?

    Sunday, September 9, 2012 6:29 PM
  • yup,
    Sunday, September 9, 2012 7:08 PM
  • Hi,

    The options you listed are correct. For option 2, you can use direct sip connections to connect Lync Server to either an IP-PBX or a PSTN gateway. For details:

    http://technet.microsoft.com/en-us/library/gg398151.aspx

    If you choose to connect PBX infrastructure, ken's blog will help you to understand the migration more clearly.

    http://ucken.blogspot.com/2011/11/migrating-pbx-users-to-lync-enterprise.html


    Regards,

    Kent Huang

    TechNet Community Support ************************************************************************************************************************ Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question.


    • Edited by Kent-Huang Monday, September 10, 2012 7:19 AM
    • Marked as answer by Kent-Huang Tuesday, September 25, 2012 1:31 AM
    Monday, September 10, 2012 7:19 AM