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DracoFelis
Premium
join:2003-06-15
| reply to ejrobinson
Re: How to do an SPA-3000 setup like mine...
said by ejrobinson  :1. Why use stun? Some people here say stun is to be avoided if possible. You seem to think the opposite. While a public "routable" IP address (i.e. not being behind a NAT router) is probably best, I prefer STUN to the alternate ways of doing NAT traversal (if, like many of us, you are "stuck" behind a NAT router). As I see it, here are the pros/cons to the three ways a Sipura can do "NAT traversal" (i.e. the three ways a Siupra can work behind a NAT router):
1) "Outbound Proxy" is popular with service providers, because it is also the way that works with the greatest variety of routers. However, it has two serious side effects IMHO. First off, it forces all calls to go via the provider's SIP proxy, which means no "tricks" like "SIP reinvite" to redirect the call. And 2nd (and more serious), because all calls go via the provider's SIP proxy, you are pretty much stuck with only one VoIP provider (even on an SPA-3000)!
2) The 2nd way to do NAT traversal (properly run behind a NAT router), is to manually put in the outside IP addresses and ports. This works, but can be a pain to setup. And furthermore, you will have to manually change it whenever (for example), your dynamic IP address changes. i.e. this is a PAIN to maintain.
3) That leaves STUN as the last (and my preferred) choice. STUN is essentially like #2 above, but it automates the process. Essentially, you connect to a STUN server somewhere on the internet, and that server will echo back to your device "you connected to me from external IP address so and so, on port such and so"). The device (in this case a Sipura adapter) then uses that STUN info (that was echoed back) to auto-configure itself as if you used technique #2 above. So you get the benefits of technique #2, without having to manually configure the setup, and without having to reconfigure things if/when your IP address changes. And the only "price" you pay for the auto-config, is that you are dependent upon using an external "STUN server". That's why I prefer the STUN method of NAT traversal.
said by ejrobinson :2. Would it be possible to use say lingo (and its ata) and a sipura 3000 at the same time, using say broadvoice or another voip service? If so, how? I've not tried it, however it should be possible.
What you would do is plug the "Phone" output of your lingo ATA into the "Line" jack of the SPA-3000. You would then configure your SPA-3000 to access both your BYOD VoIP accounts (setup in the SPA-3000 itself) AND the analog "phone line" (on "gateway 0" of your SPA-3000) from the "Phone" hooked up to the SPA-3000 (and you will have to do this step, as the SPA-3000 is NOT configured this way by default). Since the "Phone Line" hooked up to the SPA-3000 is really your Lingo adapter (in this example), you should (at least in theory) be able to access both the VoIP services programmed directly into the SPA-3000 and the services on the external (lingo) adapter from the same "phone".
Essentially what this setup does, is make the SPA-3000 think you are using both VoIP services and an existing "phone line" from the SPA-3000. But the SPA-3000 has no way of knowing that the "phone line" you have hooked it up to, is really a "locked ATA" from another VoIP provider (in this case Lingo). As far as the SPA-3000 is concerned, it is just using an analog phone line like you told it do. And as far as the Lingo adapter is convinced, you just plugged a "phone" into it, like it was expecting (it's just that the "phone" in this case, is the "Line" side of the SPA-3000). So in theory at least, both adapters should be "happy" (because they should both be seeing what they expect on those respective jacks), and you should be able to access both services from the same phone (attached to the "phone" jack of the SPA-3000). | |
kreil
join:2005-08-20
Austria
| Dear DracoFelis,
Maybe I'm confused here. What do you mean with the "line" jack of the SPA3000? It would have an FXS port going to the analogue phone, an FXO port to go to the (analogue) phone company, and an Ethernet port. Which of these are you referring to, or is there another, fourth port?
Best wishes,
David. | |
DracoFelis
Premium
join:2003-06-15
| said by kreil : What do you mean with the "line" jack of the SPA3000? It would have an FXS port going to the analogue phone, an FXO port to go to the (analogue) phone company, and an Ethernet port. The SPA-3000 has two RJ11 telco jacks labeled "Phone" and "Line" (in addition to the RJ45 jack for the ethernet).
The "Phone" jack is really an FXS port, and the "Line" jack is really an FXO port. I think they just labeled them "Phone" and "Line" (and also used those terms in their web interface and their documentation), to make them easier for non-telco people to understand. Since Sipura refers to them as "Phone" and "Line", I continued those labels, instead of calling them FXS/FXO, to avoid confusing people who might wonder which jack is which.
It makes sense in a way, as people are used to hooking up a "phone" to a jack labeled "Phone". Likewise, it makes sense to "a normal user" to hook up a "phone line" to a jack labeled "Line". But how many people that aren't already telco experts would know what an FXS or an FXO is? | |
kreil
join:2005-08-20
Austria
| Sure, you're perfectly right! I was just trying to clarify which ports you were referring to (I don't have an SPA3000 in front of me - yet?)
Say, I have just been pointed by colleagues to a non-Sipura device called Fritz!Box Fon by the German company AVM, which apparently is similar to the SPA3000 in features just better documented. Moreover, it is apparenlty running Linux inside the small quiet box (bit bigger than the SPAs), and there are inofficial firmware patches that activate a telnetd and let you login to it from the outside. Sounds like haven for finding tricks to do more with it than intended. Then again, I've never seen it mentioned on these forums. Have you heard anything about it ever?
Also, while there are versions of it that have a DSL modem built in and which do QoD traffic shaping, they don't have that for cable users (like myself).
So I'm back to a situation where I might just as well get an SPA1001 for the little I need.
My earlier question regarding this may have drowned in all the other problems I've had but: Do you have any experiences with how the Sipura SPAs live behind a normal router that is not especially designed to prioritize voice traffic in an upload heavy environment?
With best regardd,
David. | |
DracoFelis
Premium
join:2003-06-15
| said by kreil :My earlier question regarding this may have drowned in all the other problems I've had but: Do you have any experiences with how the Sipura SPAs live behind a normal router that is not especially designed to prioritize voice traffic in an upload heavy environment? In my limited experience, Sipura adapters seem to perform about as well as any ATA would when behind a non-QOS router.
In particular, if you are in a tight bandwidth situation (heavy downloading on a PC, for example), you will likely notice the sound quality drop. But if you have sufficient bandwidth (I'm on a 1.5meg/256k DSL line, for example), you will likely notice no sound quality issues UNLESS you are actively using that bandwidth at the time. I rarely have sound quality issues with my SPA-3000, and I have not (yet) put it behind a QOS router. | |
kreil
join:2005-08-20
Austria | Thanks, DracoFelis!
That's very useful to know. Off to ponder what to do an on the hardware side...
Best regards,
David. | |
kreil
join:2005-08-20
Austria
| reply to DracoFelis
Aaaargh!
sipgate.co.uk support:
"We do not currently support call forwarding and reinvite.
There are no methods to forward your number to another Sipgate number."
Thoroughly disentchanted, I am. 
That only leaves either having two phones sitting side by side, a hardware gadget to combine two phonelines, or an SPA-1001.
Or the Fritz!Box. I'm increasingly wondering...
»www.avm.de/en/index.php3
Best wishes,
David. | |
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