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Joined: January 26 2005
Location: United States
Posts: 1666
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| Posted: January 16 2007 at 7:19pm | IP Logged
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Hi Ravin,
Thanks for contacting us regarding our VOIP products. We are sorry for the lengthy delay of this response. It has been very busy here the last few days.
About your recent trial license requests: We have been updating our back end production servers that handle trial license and product download requests. It is possible that there was a glitch and your request did not make it into the production database as we performed the change over. Fee free to request new trials for whatever products you need. The requests should get logged OK at this time.
Note: VOIP Media Engine trial requests will not be processed until the end of the day tomorrow or possibly Thursday.
Now to your questions…
Item 1:
Does your engine support NAT traversal and firewall penetration?
<<< Support
Yes. If your VOIP application that uses the media engine is behind NAT and it is being deployed without the use of appropriate SIP and RTP media proxy infrastructure, then your app can tell the media engine what WAN IP address to use in its SIP and SDP information. This however won’t work for all deployments – that’s where our proxy products come into play.
The media engine API does not include native support for STUN/TURN/ICE. If you wanted to use one of those methods to identify the WAN characteristics of you VOIP application that is OK. The results (WAN IP) of a STUN or TURN operation can be relayed to the media engine via its API. If you have to perform WAN IP and NAT discovery, you can chose whatever method you want.
Because of all the network problems associates with SIP, RTP and NAT, we normally do not deploy VOIP applicationsthat are not supported by appropriate SIP and RTP media proxy architectures (domains). Deploying your voip applications with proper SIP and media proxy support turns the peer to peer problems of VOIP into a client-server architecture that removes all of the problems. Even those problems associated with symmetrical NATs.
If you develop your VOIP application using the VOIP Media Engine and then properly deploy your solution using our Centrex Proxy Server (SIP proxy) and VOIP Media Proxy Servers (RTP media proxies), you can forget about all the rotten details associated with NAT. You can also forget about having to also deploy STUN or TURN servers.
Item 2:
Can it send media over TCP?
<<< Support
No. The media engine uses UDP for SIP and RTP traffic.
Item3:
Does it recognize users that are on the same LAN?
<<< Support
The Media Engine will interchange with SIP endpoints in the private network, in the global IP address space, or with any SIP endpoint that is behind its own NAT. That being said, you still must deploy your VOIP solution using LanScape SIP and media proxies to obtain the full effect and to allow your VOIP deployment to overcome all NAT issues.
Item 4:
Is there any echo cancellation technology built-in?
<<< Support
This is a great question. The answer is: Not yet. This capability is on our development “to do” list.
:
Can we redistribute unlimited copies of our application built with your media engine?
<<< Support
Yes. For each license you purchase, you can develop a single application and distribute as many copies of your software + media engine as you require. If you are a consulting or software contract house and provide software development for customers, then a license must be purchased for each application per project. Its all in the Software license agreement.
Repost as needed,
Support
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LanScape Support Forum -> LanScape VOIP Media Engine™ - Pre-Sales Technical Support
Topic: Media Engine questions
