When you deploy Cloud PBX with on-premise PSTN Connectivity there is possible for Skype Online users to call and receive calls through the local SIP Trunk.
I followed this article to configure this settings.
Outgoing calls works fine for Online users, but incoming calls from PSTN to Skype doesn`t work. After some investigation I notice the error "Unable to resolve DNS SRV record" on the SfB Mediation Server
Our Default SIP domain is internal.com, and we have added company.com as additionaly SIP domain. This has worked fine over severals years.
When I look in the log file on the Mediation Server, I see that Invite goes to +47xxxx@internal.com
I see this error in the log file. "Unable to resolve DNS SRV record"; domain="internal.com"
We don`t have any SRV record for the internal domain and therefore this error.
I think the solution for this is to change the Default SIP Domain, but this will have huge inpact on your deployment.
I am in touch with Microsoft on this issue. A update will come as fast I solve this.
Update June 21th: It was as expected, the response from Microsoft is changing the default SIP domain so that it is equal to the Skype Online
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