Call cannot be completed error on Lync 2013

Asked By 0 points N/A Posted on -


I have configured SIP Trunks onto my Lync 2013 Server. When I try to place a call from the client to a PSTN network, I get a call could not be completed error message. I have configured SIP trucks as follows: I downloaded the latest topology from CMS in Topology Builder and saved it on the local hard disk. Then I edited the properties in PSTN Gateway properties of the Mediation Pool to ‘Enable TCP Port’. Next I proceed to define a new IP/PSTN Gateway by entering the IP address of the PSTN Gateway. Then I changed the SIP transport protocol to TCP and finished by publishing the topology to CMS. Please can anyone spot what is the mistake made that might be preventing me from placing the call? Thanks for your help.

The call could not be completed. Please

try again later.

The call could not completed due to a busy network. Please try again


Answered By 577920 points N/A #178094

Call cannot be completed error on Lync 2013


I think this is a pretty common error for Lync users where the Lync Server 2013 outbound call fails after just ten seconds or maybe more. This problem may happen if the phone system you are dialing to is very slow or kind of congested and it is by default that Lync Server hangs up the phone after ten seconds if it did not received a response.

To workaround the problem, open Lync Server configuration web page and then go to Voice Routing. See image.

Next, select Trunk Configuration then double-click Global record. See image.

After that, uncheck “Enable outbound routing failover timer” then click OK. Once this is done, you need to wait at least five to ten minutes to reflect the changes.

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