Deploying a Branch Office Server with Dialogic 2000 Gateway RRS feed

  • Question

  • Hey,

    I have successfully configured a Dialogic 2000 series Gateway to route calls to and from a Lync FE. I want to move the gateway to our branch office so have configured a branch survivability server and moved the gateway under branch office node in topology builder. Currently both the server and gateway are not physical located at our branch office and are on the same subnet as the our main office Lync pool (this is just for testing purposes before I send to the branch office).

    I created a test user and added them to the branch office Lync server. When I try and make a call outbound the phone rings but when I answer the call the line is dead and eventually disconnects.

    I have configured Lync to use TCP Port 5060 for both Mediation Server and Gateway Server. Have I missed something? 

    In the event log on the Lync Front End I get the following error:


    Could not route to Gateway, the attempt failed with response code: 503 Service Unavailable (CallID: 8871a5cd38e24c28a77dbacf083d5fe0).

    Failure occurrences: 21, since 6/12/2010 2:59:57 p.m..

    Cause: A gateway failed to respond to a request within allotted time or was unable to route the request due to some error.


    Check whether the specified gateway is up and is properly configured.




    I couldn't find any useful error messages on the branch survivability servers event log. I find that odd since the user is associated with that server. Does the branch survivability server only become active when there is a network failure?

    Being that the call rings I am guessing the SIP messages are at least getting to the Gateway and the failure is occurring when the media starts flowing. Seems to be like a firewall issue but the firewall is off on both the front end and branch server.

    Is this setup OK being that it is in the same subnet? Is it expecting the traffic to be routed out a default gateway rather than being on the local subnet?


    I am a bit stuck for ideas as I dont have a great understanding of how all the traffic is routed and in what situations. Any ideas would be greatly appreciated.





    • Moved by Ben-Shun Zhu Tuesday, December 7, 2010 7:52 AM incorrect queue (From:Planning and Deployment)
    Monday, December 6, 2010 9:02 AM

All replies

  • Please verify with the Deploying a SBA documentation if you missed something in configuration.

    Based on your feedback I would say that you configured the wrong port. Are you using a Mediation server collocated on the Front-End? In that case the Mediation server ports are:

    • from front-end to mediation port 5070
    • from gateway to mediation server port 5067

    These can be found in the port requirements documentation

    Technical Specialist Microsoft OCS & UC Voice Specialisation - http://www.uwictpartner.be If you think my post is the answer to your question, please mark it as answer so future visitors can easily find it.
    Monday, December 6, 2010 1:37 PM
  • Hey,

    Thanks for your response. Had another look at the documentation and couldn't find anything id missed.

    I upgraded my Dialogic Gateway with the just released Lync Certified Firmware and that seems to have helped.

    Still one small problem - when users are connected externally they cannot make calls through Lync mediations servers. I am still using an OCS 2007 r2 Edge server, so I think this maybe the issue as there is no problem when calls are routed through OCS Mediation servers when connected externally. I guess the legacy Edge server cannot communicate directly with a Lync Mediation server?? Can anyone confirm this?




    Wednesday, December 8, 2010 1:30 AM
  • Hello Andrew

    I would like to ask you some questions regarding your experience with Lync & Dialogic Gateways. I´m working on a project to integrate our Exchange & Lync with our PBX. May I have your mail ou IM contact?

    Thank you.


    Monday, March 28, 2011 2:23 PM
  • Hey Thompson,

    No problem at all. It would be a pleasure if I could help you out. My Lync address and email are both andrewm at olympic.co.nz. Add me to your contact list.


    Monday, March 28, 2011 7:07 PM