I'm strugeling with this problem for some time now.
While Android Lync 2013 clients can connect to Lync 2013 server I have problem with IOS devices. It is a small configuration - FE server std + edge server + proxy arr server + SIP mediation server. $ external IP addresses.
In this post I have noticed that this SRV record (External DNS/SRV/5061 _sipfederationtls._tcp.contoso.com -> sip.contoso.com) is required for mobility and the push notification.
So I have created it and pointed to Access Edge service external interface and I would expect that Lync edge server would listen to port 5061 on that interface/IP address. But it does not. It is listening just on internal edge server interface. Any idea why?
Is that record and access to 5061 port really needed for Lync mobile clients?