What is MRAS server?

MRAS stands for Media relay Authentication services. MRAS is used to authenticate Audio/Voice /Media & Audio/Video Edge Server. MRAS will only come in to the picture if the call is going through edge server. MRAS credentials remains valid for 8 hours and gets auto generated before the time of expiration.

What is Mras in Skype for business?

Skype for Business Media Relay Authentication Service (MRAS) and troubleshooting guidelines. In Skype for Business, every time you want to talk with a remote user you need to find an available path to establish the sRTP traffic.

What is a Lync Front End Server?

The Front End Server, along with the Back End Servers, are the only server roles required to be in any Lync Server Enterprise Edition deployment. A Front End pool is a set of Front End Servers, configured identically, that work together to provide services for a common group of users.

What is Rtcsrv service?

Note RTCSRV.exe is a process for the Front End server service.

What is Media Relay Server?

the media relay server – A server, in the perimeter network, that has two separate network interfaces or edges (one for accepting connections from internal clients and another for accepting connections from external clients) and that is used to enable applications to pass audio and video data across NATs and firewalls.

What is Microsoft Lync Server 2013 communications software?

Microsoft Lync Server 2013 communications software offers instant messaging (IM), presence, conferencing, and telephony solutions that can support enterprise-level collaboration requirements. Want to download a copy of the Lync Server 2013 documentation?

How does Lync handle audio/video connections from external clients?

In a proper deployment these connections would be coming from an internal Lync server directly to the Edge internal interface. The Audio/Video Edge (Media Relay) services listens on both interfaces, as it must do so to proxy media connections between internally connected clients and external clients/servers.

Why can’t I connect to Lync with an access edge server?

Because the Access Edge Server cannot authenticate Lync users and must pass all authentication traffic through into the internal servers then it in turn also cannot authenticate ICE connections from these same users.

What is the port range of the Lync Server?

It is important to understand that this port range is only opened on the external A/V Edge interface, not the internal interface. All internal Lync clients and servers will tunnel media directly to either 3478 (UDP) or 443 (TCP).