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K-20 KOCO AdministrationMeet the people and passion behind the network.
What is the K-20 Education Network?See how and why we’re a public priority.
Technology and SupportGet expert technology services and support.
Links to Content, Applications, ContractsWorld-class resources are just a click away.
K-20 KOCO AdministrationMeet the people and passion behind the network.
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Here are some common questions and answers regarding the K-20 H.323 Network.
Q: I'm registered. Now how do I make calls? A: To make a call to another H.323 endpoint, just dial their H.323 Extension. Q: Why is the K-20 H.323 Extension so long? A: The K-20 network is integrated into the Internet2 VideNet network. As part of this integration, our dial plan is based on the industry standard GDS (Global Dialing Scheme) dial plan. For more information on how your H.323 Extension is constructed please see the tutorial. Q: How do I find the number for a particular H.323 site? A: First, try asking the site you want to call. Second, check the Resources section of the KORRS scheduling system. Learn More >> Q: I only have IP connectivity. How do I call, or receive calls, from a site that only has ISDN lines? A: You can schedule a 2 site call with our MCU service. In the future, K-20 Education Network may provide an ad-hoc gateway service to authorize sites, but that is not currently available. Q: Can I still make calls to other endpoints by dialing their IP address? A: Yes, although your endpoint will still check with the K-20 Gatekeeper before connecting the call. Currently, the K-20 Gatekeeper does not block any calls that use an IP address as a destination. Q: If I am registered to the K-20 Gatekeeper, will I still be able to connect to endpoints outside of the K-20 network? A: Yes, the K-20 Gatekeeper does not restrict out-of-network IP calling. Simply place a call to the far end site using their IP address as the destination. A reminder though, that call signaling will still route through the K-20 Gatekeeper, so if the far end has a firewall that is blocking traffic from the K-20 Gatekeeper, your call will not connect. Q: What ports do I need to open on my firewall to allow H.323 to work? A: The short answer is, all of them. H.323 dynamically allocates a random port to use for each new call so you cannot specify a small range for use by your videoconferencing endpoint. Furthermore, although all call signaling will be between you and the K-20 Gatekeeper, the actual video stream will go directly between you and the far end site. You may have H.323 specific equipment and firewalls that are capable of providing firewall protection while still allowing H.323 traffic to traverse your network; however, K-20 Video support does not provide technical support for any firewall related issues. You must work with your regional ITU in resolving issues related to having a firewall in front of your system. Q: Why is it important to get an assigned K-20 H.323 Extension? A: There are two rules that the K-20 Gatekeeper uses to decide whether it will authorize your endpoint's registration request. If the answer to either of these questions is no, the gatekeeper will automatically reject your registration attempt. #1: Does the IP in your IP header match the IP embedded in your H.323 payload? This becomes an issue whenever you are behind a NAT firewall. See your ITU for further details. #2: Is the H.323 Extension you are using to identify yourself unique? The only way to guarantee that your H.323 Extension is completely unique is by using an H.323 Extension assigned by the K-20 Gatekeeper Administrators. They control the K-20 H.323 Extension database and will guarantee that the number assigned to you is not used by anyone else now or in the future. Furthermore, it is possible to cause serious disruption to the K-20 H.323 Network by registering your endpoint with random number sequences for the H.323 Extension. If your endpoint is identified as being the cause of such an outage, you may be prohibited from using the K-20 Gatekeeper (and therefore the K-20 MCUs) until your H.323 Extension is corrected. Q: If I register to an organization's (i.e. ESD, SD, etc) gatekeeper that is peered to the K-20 Gatekeeper can I still be called directly? Yes, as long as your gatekeeper's administrator has configured their gatekeeper to receive incoming calls from the K-20 network properly, you should be able to receive calls via an H.323 Extension. Contact your local Gatekeeper Administrator for further details on your local dial plan. Q: I'm connected to the far-end but either I cannot see video or they cannot see video. Is the K-20 Gatekeeper blocking our video/audio stream? No, all video and audio transmissions are sent directly between the two endpoints that are in the call. They do not tandem through the K-20 Gatekeeper. Only call signaling is handled by the K-20 Gatekeeper, and that would not prevent a video stream from reaching your endpoints. |