atcomsystems.ca/forum Forums VOIP Phones & IP PBX VoIP & Cloud Phones, Hosted PBX, General IP Phones SIP Registration

But if it's a 24 button phone and it works the same it's NOT using SIP protocal. SIP does not support all the feature sets of a digital phone if Comdial is saying that they are full of it.

Did I say it supported all the functions. Man, you're needing a day off. Everything I post you take issue with.

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I'm also working with Comdial & trying to figure this SIP stuff out. I understand exactly what you're saying & to this point I am not aware of any public SIP registry that works like DNS records for email & web.
1) How do I set up a SIP call between SIP devices that do not share the same SIP registrar? I am not aware of any way to do this. As far as I know both devices must be registered on the same server. You could try putting the SIP registrar on a public IP so that all phones from all locations register to the MP5000 with the public IP. This seems to work fine accept that another problem comes up. Since the voice path of SIP is peer to peer you are left with no voice path even though call set up works just fine & the phones ring. Obviously this is becuase the SIP endpoints are on two different networks each having private IP addresses. Here's where Comdial comes in with their concept of setting up VPNs between all locations that have SIP phones. What we need is some way to do NAT traversal in order to get the voice path set up.
This is my understanding--I'm still learning this myself.

AWEAVER: I'm glad you know what I'm talking about. I'd really like to comment and get your feedback, but quite frankly, one of the reasons I am here is to learn and the other reason is to enjoy myself. Coral seems bound and detrmined on robbing me of both.

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No Mark, not at all. LOL. Trust me, I have already gotten to play with Sprints new beta SIP platform and it's really cool to use Cisco phones on it. The one app that I love is using a freeware SIP phone on a PDA with a wireless connection as a phone. It was really cool to play with.

aweaver that's the point. Sprint has a new unit for the phone system we put in to fix NAT's issues. They call it a sentinel.

The entire issue is explained in complete detail in this white paper from Avaya.

https://www.sipcenter.com/sip.nsf/html/WEBB69TLRZ/$FILE/AVAYA-Converged_Communications_With_SIP_lb2343.pdf

Go to page 10 of the PDF file and what I am talking about is eplained very well. The entire document is a great resource for SIP technology.

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This Avaya document spells it out alot better than most do. Still again SIP is still the same no matter what manufacturer is utilizing it. All of the documents on the SIP Center are all great and detailing the same in regards to terminalogy.

Mark what Comdial is telling you is true for the moment. There is no public registry or DNS for any SIP endpoint to register with. The SIP Server Blade in the MP5000 is the proxy to which an endpoint does it's registration. Lets say you have your MP5000 all setup with your SIP and working within your intranet. Now if I as a remote user would like to SIP to you with my EP200 through the internet, then you would have to provision a SIP station and provide a VPN tunnel for me to have access to the SIP server blade on the MP5000. I probably have said what you already know about this, but hopefully other techs out there can provide insight to other manufacturers capabilities. We are all in a new learning curve here, but far advanced than most. SIP and VoIP have no close proximities to Voice Mail in its infancy whatsoever. SIP has been around from what I see is about 15 years now. The benefits and advantages are just now starting to be realized, most of all LOW BANDWIDTH. There are new ideas in developement for SIP that will be available next 6 to 18 months. Join the SIPForum and read what is lurking around the corner.

Coral: I'm aware that the Sentinal allows for NAT traversal for Sprint's QSIG protocol but was not aware that it could be used with sip endpoints. Are you telling me that this thing can be used for SIP? What about using it with another PBX other than the IPX?