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21

Yes. Being in a position currently where the powers that be bought a Panasonic PBX. There's a bunch of features that aren't there (or rather, are individually licensed). Such as MeetMe (conference calling), or hot-desking. There's also the problem that all the phones are effectively hard-wired to their ports. They had to run new cables for the phones, ...


19

In this day and age you cannot directly compare a soft switch to a PBX. A soft switch, or software that connects phone lines with one another, is at the core of all modern PBXs. Asterisk is not a PBX but it can be configured to function as one. Also most of the functions provided by an PBX can also typically be performed by a class 5 soft switch. Perhaps an ...


12

All the answers to your questions are "it depends". If you use a PBX system like Asterisk where the audio data is actually handled by the server computers you'll have much steeper CPU and I/O demands on the server computer (along with finicky reliance on timing-- something that virtual machines don't necessarily do a great job with). If you a PBX system like ...


9

Virtualizing a PBX is a challenge, due to one main aspect: There is no guaranteed scheduling of your PBX VM and the general scheduling behavior could introduce jitter. That being said you also have to think about how your line-cards (if you need S0 to some other PBX etc.) need to be presented to the VM and if things like vMotion and HA make sense. There are ...


8

Spend the extra money. I'm running my second Asterisk box and wouldn't do it without echo cancellation. I know it's a painful cost but since we make hundreds of outbound calls a day I wanted to take every step possible to eliminate echo (ie we are the source of the echo). I did this even though the only analog line we use is for our fax machine. Most of ...


7

Your networking issues will increase exponentially. You'll have to troubleshoot issues with latency from various locations, you'll have worse packet jitter, etc. I've had nothing but heartache with SIP to remote sites/servers.


6

Just to follow on from tcv (get the manual from his answer). With the KX-TD and newer KX-TA Series (this includes the 308) you'll need to... Go to the main console (extension 101) and put it to programming mode by moving the switch on the phone to programming position. Press *#xxxx (where xxxx is the password for programming). This is usually 1234 ...


6

I actually use these exact phones in my office. The phone is patched directly back to the PBX, and phone settings such as ext and name are configured at the PBX port level. You will need to locate the patch panel port that your phone is plugged into, and patch into the same port on your PBX when you swap it to retain the ext and what not.


5

A PBX (Private Branch Exchange) is a device to switch calls between telephones. Some like Asterisk support VOIP (Voice Over IP). When I looked at implementing Asterisk a few years ago, I found I was looking at a hefty hardware expense for the phone interfaces. FreeSWITCH is a VOIP switch and handles switching calls between VIOP endpoints (connections). ...


4

If you aren't comfortable with telecom systems and the idea of assembling your own system from the available (software and hardware) components on the market I would suggest a nice, packaged Asterisk solution, such as the Trixbox CE appliance or an appropriate model of PhoneBochs. You can get these with appropriate line cards (Analog or Digital/T1) and set ...


4

The only thing I can think of is if your router has a SIP ALG and is crashing because of some bug in it when it doesn't get the ACK. If your router does have a SIP ALG you should try and find a way to turn it off. It's generally accepted now that SIP ALG's are bad news and cause far more problems than they ever solve. Update: If you're writing your own SIP ...


4

Trixbox is pretty good (http://www.trixbox.org/). It's basically Asterisk but shake'n'bake style. Their community edition is a free version which installs Asterisk plus some fancy front-end tools among other things. It has IVR (auto-attendant), SIP support, remote extensions and other cool stuff. Try it out.


4

I would separate your question into 2 areas: Going VoIP Going Open Source Regarding the first one, I believe there is not much dispute, being VoIP extremely more powerful than traditional PBX, but to name a few: Usage of same network infrastructure you already have laying around, reducing cost Ability to connect remote endpoints without expensive ...


3

Your best bet would be to set up a site-to-site secure VPN and let the phones download their configuration via TFTP over the VPN. The fundamental problem in this situation is that, even if you had a "secure" protocol over which to download the configuration, you would still have to provide the phone with some kind of security credentials (public/private key ...


3

Of course it is possible. Any system that provides services can be attacked. Ones that rely on shared resources just make the attack easier. You can DoS the public (circuit-switched) telephone network by simply picking up every receiver attached to a switch -- at some point you will have occupied every available circuit, and the next person to pick up the ...


3

I feel your pain. I have been wrestling with a PBX system recently and they can be a pain to figure out if you've not been there for the installation. I think your best shot to find a company in your area that services this particular PBX and see if they can get you the installation, user, and programming manuals. You can find the User Manual online and ...


3

Wouldn't it be easier to ask the employees who's been calling the number or calling the number yourself and asking them who's been calling them? Every problem doesn't require a technical solution. Also, as others have said, contact a local vendor that services that brand PBX and ask them for assistance. They'll have the correct software and hardware and can ...


3

Using a Call Accounting Software it the right approach in this case. Look for one software that supports your model. Include "SMDR" or "CDR" keyboard in your search, these are the common names for call accounting logs you want to capture and parse.


3

I have looked at quite a few of the soft phone clients one of my favorites is x-lite http://www.counterpath.net/x-lite-download.html I don't like that you can't transfer (with the free version) but it seems to be a very solid client. You should also check out this comparison http://en.wikipedia.org/wiki/Comparison_of_VoIP_software


3

I have had good success using ZoIPer (formerly idefisk) under both Linux and Windows. One major advantage of that client is that it supports both IAX and SIP. The free version supports two line registration profiles and they have paid versions as well.


3

An "unregister" is a REGISTER wherein you set the expires for one or more Contact URIs to 0. You may do so either with the Expires header - "Expires: 0" - which applies to all Contact URIs in the REGISTER, or with a parameter - "Contact: ;expires=0 - which will only affect that URI's registration. You may also unregister ALL contact URIs for your ...


3

We bought a FreePBX Appliance. There is also trixbox. Both are layered on top of Asterisk. Whichever route you go, make sure you setup good monitoring of the phone system. Ours has frequent problems with "All circuits are busy" or fast busy situations. We're constantly adding new Nagios plugins to monitor the health of the phone system to reduce the ...


3

Yes, is possible and from my point of view is the best solution. For calling your programmers you can use a different phone number, not 111-222-3333. I use the same solution for a marketing team and it works perfect. Short example: exten => 111-222-3333,1,Answer() exten => ... play IVR exten => ...


3

is it dependent upon configuration? It surely is. And the configuration will depend on your requirements. If you do recoding, call recording or if your external users are behind a NAT or unable to contact your SIP provider directly, you can't bypass the PBX in the media path. The asterisk extension option for a direct media communications path is ...


3

I would look at Symantec System Recovery . We have used this to create an image of a running system with specialized software installed and then restore to different hardware. It can also convert to a VMware virtual machine or HyperV virtual machine which has also worked for disaster recovery for such systems. There is a trial version available. You may ...


3

Sounds like your looking for a free solution but I thought I would throw this out as a potential alternative that does not require any setup, installation or complexity on your end. The trade off... a little bit of money every month: http://grasshopper.com/ It's designed for small business but it does everything Google Voice does and supports faxing and ...


3

I've seriously considered this in the past and come up with one very good reason not to virtualize. What happens if you want to connect your PBX to the standard PSTN network? Since doing so requires custom hardware it makes sense to avoid going virtual. This has the added benefit of if your SIP provider craps out you still aren't totally out of business.


3

There's several down-sides imho. The least of which is... if the phone goes down/gets rebooted... the PC will be disconnected. Additionally, if you get into provisioning & VLANs, there sometimes can be a headache to make sure the VoIP data is on the proper vlan... separate from the PC's vlan. Bandwidth typically isn't an issue unless the workstation ...



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