You might have already went through my tutorial on multiplying any 2, 3 or 4-digit number using a technique called Criss-Cross method of multiplication. In this article on Mathematical Shortcuts, we are going to learn about multiplication between special group of numbers. So, just write down some random number and take its reverse and see if you get the right answer everytime. Are you interested in writing about quantitative aptitude, mathematical shortcuts, Vedic Maths and never got a chance to do it? Submit your guest articles to SapnaEdu. This article takes a look at the services and network traffic which travels to, and through, the Edge Server in an effort to simplify deployment and troubleshooting by gaining a basic understanding of the Edge Server’s purpose. Before looking at the individual ports it is important to understand that the Edge Server is comprised of five different Windows Services which are responsible for handling different types of traffic and requests. When troubleshooting it is helpful to know the basic Service Name and well as the core application for each of the Edge services.
As shown above there are multiple ports utilized by the Edge server with some of the same port numbers (e.g.
For the remainder of this article the following Lync Server Topology is used throughout all example text and screenshots. To verify that the proper ports are listening and the Edge services are functional the following validation checks can be performed.
Among the results of all static and dynamic ports for any service or application on the server the specific Lync Server listening ports for the various Lync Edge services should be displayed. The following entries were pulled from the command output and listed in a table for easy identification. What the results above show are all of the static listening ports used by the various Lync in an unconnected Listening state.
The netstat command also provides a switch to display the executable name for each opened port to assist in identification of the which service owns which listening port. On the Edge Server open the Windows Command Prompt and issue the “netstat –abn” command to display the same output as before but with additional lines showing the service program file name.
By matching up the reported executable names in the results the following table can be created, indicating what type of connections each port is listening for. External Web Conferencing PSOM data for client features like Whiteboarding, PowerPoint uploads, polls, and file uploads. The Web Conferencing Edge service also listens on both interfaces as it proxies web conferencing traffic between external clients and internal Front End servers. If the listening ports in the table above are compared back to the original diagram there is still one last traffic type left unaccounted for: the 50,000-59,999 port range used for media traversal. If a connection to the port fails this would indicate a problem like the service is not started or listening on the Edge server, the Edge server is unreachable due to a firewall or other port filtering or routing issue, or name resolution has failed.
The expected response would be to see the command prompt window immediately refresh and a blank window will be displayed. Leaving the telnet session open on the remote host move back to the Edge Server and issue the following command to look for the specific connection. From a remote host attempt to telnet to that same port and see that the connection is refused almost immediately.
This is because when the Telnet client connects it is neither the type of connection the Edge Server expects nor are the proper credentials available to provide to the media relay service to allow the connection to be established.


No, as the Web Components are part of the Reverse Proxy path and not related to the Edge Server. True that the 50k range is REQUIRED for OCS backward compatibility, that is not the only use for it.
Again great article and just some easy and free tools I use to hold the firewall administrator to the configuration fire! Desktop Sharing uses the same ports as audio or video but is only allowed over TCP and cannot utilize UDP.
I would doubt this as the Lync Edge server is only available for registered and federated connections. Are you very sure the internal edge interface HAS TO BE ABLE to directly communicate with the internal clients (and vice versa)? I understand the internal edge interface communicates with the front end server (and then the front end server communicates with the internal clients).
In every tutorials i've seen about configuring the edge server, people set up a permanent static route so the internal edge interface can communicate with the front end server. I checked on our firewall, I found no packet log of clients trying to access directly the internal edge interface (and vice versa).
I'm asking this because our Lync system working well (internally and externally in all possible ways, with webApp, Attendee, we usee public certfs, etc). Yes, internal Lync clients must be able to reach the internal Edge interface on at minimum 443 TCP and 3478 UDP for you to have any chance of tunneling media sessions between them and other remote clients. Just to add to Thomas point, Do we need port 5061 opened from all internal clients to internal Edge interface bi-directional ? Quite positive, although the communications are always initiated outbound so the internal clients will connect to the Edge internal IP over 443 TCP or 3478 UDP. From Lync i can add skype users (IM is working) but from skype, i cannot add users from our Lync organization. The mediation server is used to route calls to a SIP tunnel or PSTN gateway as well as transcode wideband audio codes into G.711 for transmission over the PSTN.
That sounds like it may be related to TCP media relay between your Edge and federated Edge Servers. It would be strange to exclude all external domains from content scanning if it really would need to go by the web proxy. Could you tell mie what is the port for External Data Sharing port: 8061 and If I should have it open? That port is only used on internal servers (Front End web services) and is not applicable to the Edge Server or Reverse Proxy.
If you not practiced the technique, I would advice you understand the shortcut before going through this tutorial.
You often come across questions in  the competitive examinations, where you are asked to multiply 2 numbers  where one number is exact opposite to the other number. Notice the first and the last term is same ac followed by b(a+c)  and the middle term is a2+b2+c2. If you have any doubts, please leave a comment in the comments section or write to me an email, I would be glad to help you. Note that some of these IP:Port combinations may display multiple entries as an active Edge server will have server and client connections.


All internal Lync clients and servers will tunnel media directly to either 3478 (UDP) or 443 (TCP).
I would like to use the Lync TURN server component (MediaRelaySvc.exe) without first registering a software-based SIP endpoint (that I have written) to the Lync edge server. But in the case the internal clients are in multiple ip subnets (that might be common in large organizations i guess, anyway it's our case), do we have to configure a static route to every subnet where we might have internal lync clients? After accepting, internal traffic gets routed via the web proxy and fails due to content scanning. I sense misconfiguration on our part and not something which would be designed that way, no?
I can connect from a mobile client to the edge and everything works fine but internal clients can't seem to go out through the edge. Make sure that only the external Edge interface has a default gateway set and that you’ve added the required static, persistent routes for your internal networks. Because the Edge Server is not domain joined then it will not create a Dynamic DNS record in your AD DNS zone. Some of these shortcuts are explained in Vedic Mathematics and rest of them are from my own experience of teaching students. But the additional entries should all be reported as in an Established state and only a single line for each will be in a Listening state. This many-to-one model is possible because of the deployment requirement that Network Address Translation (NAT) is not allowed between the internal Edge interface and any internal subnets hosting clients and servers. I know an MRAS credential request must be sent to port 5062 in a SIP SERVICE message, but I believe the mras uri is only returned in the 200 OK response of the REGISTER message a Lync endpoint makes to the Lync edge server. Is not the Web Conferencing part (PSOM) on the Edge server handling that traffic and what might be the reason why it fails to be routed correctly (autodiscover) ? I can see the traffic from the client hitting the edge but then I can't see anything leaving the edge. I suspect it’s because we do not have an internal DNS record for the internal facing NIC other than the FQDN of the Edge Server. Any established connections to these ports will be reported by netstat in additional lines. They only user the Edge server for media relay, so it’s possible your Edge deployment is not working at all.
But even if I create that record, I don’t know where to configure it inside of Lync 2013.
I will be posting articles on Mathematical Shortcuts, Software Tips, Programming Tips in this website.
If am wrong please correct and is there any alternative ways to reduce the cost whn using HLB.



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