Unable to Make ISD Call from LYNC 2013 RRS feed

  • Question

  • HI All,

    I have deployed Lync Front end & Mediation server collocated, I have also a pstn Gateway which handles my PSTN calls through one T1/E1.

    Now when I make ISD calls it takes 10 seconds after that calls get cancelled by Front end server.

    I am not sure that wheater it is telecom provider issue, or Phone usage.

    Early media and Early progress is disabled on gateway.

    what should be the issue here.


    Monday, July 1, 2013 5:49 AM

All replies

  • Have you enabled the Edge in the topology builder but not deployed or configuration it?  Try unchecking the "Enable outbound routing failover timer" on the Lync trunk configuration.

    Monday, July 1, 2013 4:14 PM
  • What do the outbound normalization rules look like for calls going to the PSTN? 
    Monday, July 1, 2013 6:07 PM
  • Did you assign the DID phone number to Lync users?

    Please check the voice policies and PSTN usage records and voice routes are set correctly.


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    Tuesday, July 2, 2013 9:37 AM
  • hi,

    the Edge is already installed, and Normalization rules are also correct. i dont think so DID will makes 10 seconds delay.


    Monday, July 8, 2013 10:10 AM
  • Hi, I'll look at

    1. Lync normalisation rules to see if it is getting normalised correctly

    2. Gateway logs to check if the gateway is getting the digits and is translating the rules correctly ( E.164 to standard ISDN) to its ISDN ports.

    3. Check if there is a T302 timer on the gateway and reduce it accordingly.

    In your case, I'm suspecting 2 & 3 as if it was only 3, then call would eventually succeed.

    Hope that helps - let us know. :)

    Murali Krishnan| My blogs: UnifiedMe | Twitter: @Mkris9

    Monday, July 8, 2013 11:20 AM