Saving phone number disabled due to the server policy

Do you get this error when you log on Skype for Business on an iOS Device?

If yes, then you probeably have problems with "Call me back" feature? In certain scenarios, you may not want to use VoIP. This may be related to poor network where you do not have neither WiFi, 3G or 4G networks.
In these scenarios, you would like to be called back from the Skype server instead of dialing into itself whith entering dialin number and enter a long code.


With SfB version 6.5.0.177 on iOS, then you will get this warning when trying to save your own mobile number which is also stored in Active Directory.


If you remove the mobile number in Active Directory, you don`t get this warning and the Call me back Works.


This don`t happens with Windows Phone or Andriode!


Microsoft is trying to make a fix for this in the future

Skype for Business Cloud PBX - PSTN incoming calls failed when default SIP domain is different than users SIP address

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