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  • 1.  Centralized CM with Multi-Location - Design Question

    Posted 12-28-2018 10:47 AM
    Greetings,

    System information.
    • CM 7.1
    • Duplex servers
    • VMware enviornment
    • Centralized architecture.
    • Remote sites - LSP with G450 & G430 gateways.
    • Mostly H.323 IP Phones.
    Voice Setup.
    1. CM is residing in Data center(DC). All other adjuncts - AES, CMS, ACR, MM, SM, SMGR, SBC & Video Conf servers are also in DC. DC is assigned with NR 1. One G450 gateway also in DC location (NR1).
    2. Twenty Remote Locations with local G450/430 Gateway , LSP server and H323 IP Phones, with local PSTN breakout.
    3. 80% of remote locations are connected by MPLS network & voice subnets are routable within all locations. Hence these locations can call each other.
    4. There are few small but important locations without MPLS connectivity. Their G430/LSP registering to DC via site to site VPN & local PSTN breakout. All H323 IP Phones.

    Question.
    Until now these VPN sites were not required to call any other remote locations but now there is a need for it.
    Creating VPN connection to each location is not practical & MPLS up gradation would also not happen in near time.
    What is the solution in this scenario. Please suggest.

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    Arslan Ali
    UC Consultant

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  • 2.  RE: Centralized CM with Multi-Location - Design Question

    Posted 12-28-2018 08:05 PM
    Arslan, what happens when your VPN sites try to call your MPLS sites?  Are you not achieving audio on the call?  Do you think it's due to Access Control Lists assigned to each VPN site that don't account for all of the other elements in your CM system?  We solved this by disabling inter-region direct media which forces all calls for the network region to use a DSP to terminate calls exchanged with other network regions.  The trade off is that you'll see an increased use of DSP channels and depending on how well you're provisioned (or  not), you may run out.

    Of course, this is just me guessing.  You don't really say in your post what is not working.

    Happy New Year!!
    Tom Lynn



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  • 3.  RE: Centralized CM with Multi-Location - Design Question

    Posted 12-29-2018 01:19 AM
      |   view attached
    Hi Tom,

    When VPN location is calling MPLS location - there is no audio, even if i disabled direct-ip to ip because there is no connectivity between these locations. Attaching here the connectivity of my scenario.

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    Arslan Ali
    UC Consultant
    Vodafone
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    Original Message


  • 4.  RE: Centralized CM with Multi-Location - Design Question

    Posted 12-29-2018 07:55 AM
    Hi Arslan,

    As I understand it, at the IP level established policies will not allow you to directly route between VPN and MPLS sites, right?

    For each site, configure the IP network region and maps and enable audio hairpinning while disabling inter-region IP-IP direct audio. Proper configuration of network region forms and IP network maps is essential.

    You should also take a look at the related signaling group configuration and configure accordingly. Additionally, set the H.323 station outgoing direct media and initial IP-IP direct media to 'n' so call setup/signaling is established via the media gateways/servers. Might help. 

    As Tom suggested, I hope you have enough DSP resources to accommodate this?

    Cheers,

    Tony G




    Original Message


  • 5.  RE: Centralized CM with Multi-Location - Design Question

    Posted 12-29-2018 09:16 AM
    These locations are part of one system hence no role of signalling groups.




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  • 6.  RE: Centralized CM with Multi-Location - Design Question

    Posted 12-31-2018 07:39 AM
    It's difficult to comment based on the above without seeing your network region forms. Is your intervening region set up correctly?

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    Marc Hensens
    Senior Systems Engineer Infrastructure
    Northwest Bank
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    Original Message


  • 7.  RE: Centralized CM with Multi-Location - Design Question

    Posted 12-31-2018 08:28 AM
    Hi,
    I have made NR 1 as intervening.
    DC CM and DC G450 in NR 1.DC = data center.

    NR 2 (lsp,g430) & NR 3 (lsp,g430) are not directly connected but via intervening NR 1.

    What should be correct Network Region settings as per you. 



    Original Message


  • 8.  RE: Centralized CM with Multi-Location - Design Question

    Posted 01-02-2019 08:13 AM

    Personally I'd prefer a dedicated intervening region​ which would make it easier to control your inter-region routing. The only thing I can think of without seeing the actual forms for each region, is that there may be a codec issue.

    What does a station trace show? If there is a setting mismatch that would be likely to pop up.



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    Marc Hensens
    Senior Systems Engineer Infrastructure
    Northwest Bank
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    Original Message


  • 9.  RE: Centralized CM with Multi-Location - Design Question

    Posted 01-11-2019 08:46 AM
    Intervening NR is in place but I believe the use of intervening Region is only for CAC & AGL controls.  Its no where controlling the DSP selection criteria. 

    I tried all possible ways (which my mind can think of) - CM DSP selection algorithm will always select local DSP resources (if available) then remote DSP, regardless of intervening NRs.

    For my case I did a special work around to meet my purpose.

    I had an SBCE in same DC which is connected with ITSP for SIP trunk services & via CM - SM routing manipulations I managed the call from SBCE & ultimately from NR 1 & then RTP got anchored from DC successfully & worked the way I wanted.  Its not the standard way but its meeting my purpose. 

    So the call flow is like this :

    Phone in NR 2 calls to Phone in NR 3 by prefixing an AAR code, which sends call to SM (via SIP Trunk). SM send call to SBC (via Entity Link), SBC has URI configured to return the call to SM & finally to CM as an incoming call from NR 1. 

    CM --> SM --> SBC ----> SM ----> CM. 

    Downside of this method :
    1. CLI display is incorrect (trying to fix it)
    2. User have to dial Extra AAR code before dialing an Ext.



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    Arslan Ali
    UC Consultant
    Vodafone
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    Original Message