asterisk: forward disconnect and Cox

Wed Sep 26 09:19:36 MST 2007

Yes, you can have Asterisk handle faxes/etc and even use that second 
line for outbound dialing when you don't have incoming faxes.  Trixbox 
uses asterfax which captures faxes well and sends them to email.

Adminsparadise uses hylafax and works both directions; pretty slick 
setup.  It uses 'iaxmodem' to simulate a real modem and does a great 
job.  You can use a real modem if you want to but since Asterisk is very 
touchy with IRQ's (don't share IRQ's with asterisk hardware!) I prefer 
the software modem to the hardware one just so I can turn off the serial 
and parallel ports in the bios.  Fax over voip is iffy. I did it for 
awhile and it worked sometimes; lots of issues with smearing and dropped 
calls.

As far as ip to pstn adaptors.. there are many to choose from for less 
that $100.  Most are sip based and as long as you're inside of your 
network those work fine.  Outside your local network natting can make 
getting it to work a challenge (one way audio, calls that dial and 
disconnect/etc).  The Iax (asterisk's native protocol) based ones will 
work through firewalls/etc as long as it can talk to the UDP port 4569.
If you go with a TDM400 card or the equivalent from Sangoma/Rhino then 
just get an FXS module  (gives dialtone) and 2 FXO modules (receives 
dialtone) for your inbound lines.  Also you could buy a few voip phones 
and plug them in wherever you need a phone.  If you set up your port 
forwarding right you can even plug them in anywhere with a good internet 
connection and use your PBX as if you're in your home office.

VOIP.. keep in mind that it is only as good as your bandwidth.  ISP's 
love to do things to cram more users into the same bandwidth.... traffic 
shaping, compression, lopsided bandwidth (heavy download, light upload), 
etc that can affect your ability to make calls.  Unfortunately speed 
alone isn't good enough; latency can really wreak havok on voip calls.  
I can sneakernet 10G an hour to the other side of the valley; it 
wouldn't be a good conversation though (grin).
There are tools online to get an idea of how good your connection is: 
http://www.dslreports.com/tools
Run the speed tests from several servers, the line quality test, and the 
voip bandwidth tester.
Keep in mind that if you're on a connection that varies such as cable 
that your results may vary. 

If you get rid of your second line then you'll need a good voip provider 
to make more than one call at a time (inbound/outbound).
These are the ones I recommend currently: voipstreet.com, les.net, 
vitelity.net, junction networks (junctionnetworks.com), and teliax.  
I've heard nothing but good things about voicepulse but haven't used 
them.  Junction networks and teliax are a bit pricey but they're reliable. 
I recommend signing up with more than one for those occasions where they 
flake out or temporarily outgrow their hardware/bandwidth.  Stay away 
from Broadvoice and nufone.

Asterisk has a bit of a learning curve.. if you don't mind it you'll 
love Asterisk.  If you're already adept with Linux (especially Centos) 
then you're 1/2 way there.  In many ways Asterisk is like Linux was in 
the mid-90's.  It is accelerating quickly and becoming more robust every 
day.  Project such as FreePBX make it MUCH easier to manage. 

JD

Jon M. Hanson wrote:
> I, too, would like to eventually get Asterisk set up at hy mouse if for
> no other reason to say I have my own PBX (not to mention the extensive
> features that Asterisk has). I'm thinking of installing Asterisk at Home
> (now TrixBox).
>
> Fortunately my entire house (phone jacks and network jacks) are all CAT
> 5e so it should be really simple to set up IP phones throughout the
> house.
>
> I am going to need the analog adaptor for my cordless phone and the
> add-in card to interface with the PSTN (I'm not going pure
> voice-over-IP). Can someone make some recomendations for the analog
> phone adaptors? Also, I'd like some links on where to find the PSTN
> interface cards below if possible.
>
> I actually have two incoming lines (one goes to a fax machine). Is there
> a way for Asterisk to detect an incoming fax and then store it for
> e-mailing or display later? If so then I wouldn't need the separate line
> and I could just let Asterisk automatically detect an incoming fax call.
>
>
> On Wed, Sep 26, 2007 at 08:09:38AM -0700, JD wrote:
>   
>> Asterisk is cool!
>> If you're going all voip you don't need pstn hardware.
>>
>> Sangoma and rhino cards are usually  less expensive and have built in echo cancellation.
>> The x100p cards aren't  very good; get tdm400 card if you go digium.
>>
>> As far as ip phones...polycom, aastra, snom are good; grandstream 2000 is ok; stay away from grandstream budget phones.
>> JD
>>
>> --
>> sent from phone
>>
>> -----Original Message-----
>> From: chip33az at netscape.net
>> To: "Main PLUG discussion list" <plug-discuss at lists.plug.phoenix.az.us>
>> Sent: 9/26/07 7:51 AM
>> Subject: Re: asterisk: forward disconnect and Cox
>>
>> I will be looking into Asterisk very shortly as my company will no 
>> longer pay for my home office phone line.  I have Vonage now and like 
>> it, but it costs more than I use.  I'm thinking of going with VoicePulse 
>> for the long distance/phone service.
>>
>> Have you looked at the actual digium cards?  They sell for about $140, 
>> but are supposed to be the best out there.
>>
>> PLUGd at LuftHans.com wrote:
>>     
>>> moin moin,
>>>
>>> still trying to get Asterisk working in my spare nanoseconds.
>>>
>>> I found documentation suggestion I verify that "disconnect supervision"
>>> aka "forward disconnect" is enabled.
>>>
>>> I hadn't realized we have Cox phone service rather than Qwest. Sorry for
>>> not having that info on previous emails.
>>>
>>> Just talked to phone tech support at Cox ( after getting Internet tech
>>> support twice and being disconnected ). The person was nice, patient and
>>> appeared to be willing to help out. She didn't know what "disconnect
>>> supervision" or "forward disconnect" were, so put me on hold to talk to
>>> internal tech support.
>>>
>>> The response she got was that my answering device isn't compatable with
>>> Cox phone service :(.
>>>
>>> Does having service via Cox rather than Qwest change what I need to do to
>>> get Asterisk to recognize call initiation and termination? Asterisk
>>> doesn't recognize hangups and ties up the line for long periods of time.
>>> Some might see this as a bonus :).
>>>
>>> Do I need to call it something else when asking for support from Cox?
>>>
>>> Any recommendations for a card that actually works? I want to connect to a
>>> POTS line for receiving and initiating phone calls. I want the possibility
>>> of that POTS line to be whatever source of POTS lines we get in the
>>> Phoenix area.
>>>
>>> I also want to ring through the phone card to a phone.
>>>
>>> I also want to use a small Sipura SIP box that has 2 RJ11 connectors and
>>> can handle two phones.
>>>
>>> There are many other things I want to do, but that's the initial setup. If
>>> I can get that working such that I don't break it with further
>>> experimentation I can play with Asterisk.
>>>
>>> ciao,
>>>
>>> der.hans
>>>   
>>>       
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-- 
JD Austin
Twin Geckos Technology Services LLC
email: jd at twingeckos.com
http://www.twingeckos.com
phone/fax: 480.288.8195 

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