difference between IP PBX and IP Centrex



  • Hi guys,,,

    i want to know the difference between IP PBX and IP Centrex,

    thanks


  • Service Provider

    Remove the "IP" from this. The IP just means Internet Protocol and refers to doing these things with VoIP, nothing more. So ignore that.

    So the question is PBX vs. Centrex.

    A PBX is a private branch exchange, meaning that the customer owns the equipment. It is your own, private phone equipment. Centrex is when there is PBX functionality but it is owned and hosted by the phone provider. Most hosted PBX services are misnomers and are actually Centrex in disguise.

    http://www.voip-info.org/wiki/view/IP+Centrex



  • ok, thank you
    i see now because i just learned this term and this is what we have actually for one year and half, but i just know the term, lol
    before, if someone ask me about our voip installation, i used to say we have a hosted IP PBX
    now i know the correct term

    thank you



  • the ISP provide us with a cisco voip gateway that connect our IP cisco phones to their IP Centrex via copper line (trunk), they charge us monthly per extension (about 20 $/extension ) and give us access to a web management console to manage few things like ring groups or changing extension numbers ...


  • Service Provider

    Yes, that would be IP Centrex.


  • Service Provider

    This is why @NTG sometimes refers to their hosted PBX product as "true hosted pbx", because it is not a shared service, can be taken on premises by the customer and is owned by the customer. It is not a Centrex. I don't know of any other "Hosted PBX" vendor that actually does hosted PBX and not IP Centrex.


  • Service Provider

    @IT-ADMIN said:

    i see now because i just learned this term and this is what we have actually for one year and half, but i just know the term, lol

    Centrex stands for Central Exchange.
    PBX stands for Private Branch Exchange

    The correct term today depends really.
    Ring Central and 8x8 are Centrex style services.
    A hosted PBX is still a PBX and not a Centrex service.
    The new term is MultiTenant.
    Elastix 3.0 is a a multi tenant system. Thus the rename to Elastix MT.



  • @scottalanmiller said:

    This is why @NTG sometimes refers to their hosted PBX product as "true hosted pbx", because it is not a shared service, can be taken on premises by the customer and is owned by the customer. It is not a Centrex. I don't know of any other "Hosted PBX" vendor that actually does hosted PBX and not IP Centrex.

    to be honnest i get confused about this, is there any differance between hosted IP PBX and IP centrex ?? i think it is the same thing


  • Service Provider

    @IT-ADMIN said:

    @scottalanmiller said:

    This is why @NTG sometimes refers to their hosted PBX product as "true hosted pbx", because it is not a shared service, can be taken on premises by the customer and is owned by the customer. It is not a Centrex. I don't know of any other "Hosted PBX" vendor that actually does hosted PBX and not IP Centrex.

    to be honnest i get confused about this, is there any differance between hosted IP PBX and IP centrex ?? i think it is the same thing

    VERY different, as I just explained. One is private, one is owned by the service provider.


  • Service Provider

    @IT-ADMIN said:

    to be honnest i get confused about this, is there any differance between hosted IP PBX and IP centrex ?? i think it is the same thing

    They are certainly not the same thing. I just defined the difference.



  • sorry guys for my English, sometimes i can't fully understand the answers, so Hosted IP PBX is a private thing owned by the costumer meaning that the ISP just hosting it,
    and the IP Centrex is owned by the ISP and shared between multiple costumers, in this case the costumer pay for the service



  • @IT-ADMIN said:

    @scottalanmiller said:

    This is why @NTG sometimes refers to their hosted PBX product as "true hosted pbx", because it is not a shared service, can be taken on premises by the customer and is owned by the customer. It is not a Centrex. I don't know of any other "Hosted PBX" vendor that actually does hosted PBX and not IP Centrex.

    to be honnest i get confused about this, is there any differance between hosted IP PBX and IP centrex ?? i think it is the same thing

    If I'm understanding this correctly, a PBX only has extensions, etc for your company on it. A Centrix has many customers extensions on it.


  • Service Provider

    @IT-ADMIN said:

    sorry guys for my English, sometimes i can't fully understand the answers, so Hosted IP PBX is a private thing owned by the costumer meaning that the ISP just hosting it,

    In theory, but I've never heard of an ISP hosting an IP PBX. ISPs just don't do that, there is no incentive for that. ISPs always do IP Centrex.


  • Service Provider

    @Dashrender said:

    @IT-ADMIN said:

    @scottalanmiller said:

    This is why @NTG sometimes refers to their hosted PBX product as "true hosted pbx", because it is not a shared service, can be taken on premises by the customer and is owned by the customer. It is not a Centrex. I don't know of any other "Hosted PBX" vendor that actually does hosted PBX and not IP Centrex.

    to be honnest i get confused about this, is there any differance between hosted IP PBX and IP centrex ?? i think it is the same thing

    If I'm understanding this correctly, a PBX only has extensions, etc for your company on it. A Centrix has many customers extensions on it.

    While that is effectively true, that's not the factor that causes one to be one and one to be the other. No one actually makes a Centrex system for only one customer (although on day one, in theory, they might only have one signed up until the second customer comes along.) PBXs are almost never shared, but we certainly have PBX customers who put multiple companies on a single PBX.



  • @scottalanmiller said:

    @IT-ADMIN said:

    sorry guys for my English, sometimes i can't fully understand the answers, so Hosted IP PBX is a private thing owned by the costumer meaning that the ISP just hosting it,

    In theory, but I've never heard of an ISP hosting an IP PBX. ISPs just don't do that, there is no incentive for that. ISPs always do IP Centrex.

    yeah exactly, this is what confused be, because i didn't see any benefit for the ISP to host your IP PBX
    thanks


  • Service Provider

    @IT-ADMIN said:

    and the IP Centrex is owned by the ISP and shared between multiple costumers, in this case the costumer pay for the service

    IP Centrex would be owned by the phone provider. No necessary connection to the ISP. I realize that in your country the ISP, phone provider, Centrex provider and many other functions are the same company and are actually the government so this gets blurry for you. But as IT terms go, ISP is not in use here.


  • Service Provider

    @IT-ADMIN said:

    @scottalanmiller said:

    @IT-ADMIN said:

    sorry guys for my English, sometimes i can't fully understand the answers, so Hosted IP PBX is a private thing owned by the costumer meaning that the ISP just hosting it,

    In theory, but I've never heard of an ISP hosting an IP PBX. ISPs just don't do that, there is no incentive for that. ISPs always do IP Centrex.

    yeah exactly, this is what confused be, because i didn't see any benefit for the ISP to host your IP PBX
    thanks

    It would be beneficial TO YOU, but not TO THEM so they won't provide it.


  • Service Provider

    @scottalanmiller said:

    PBXs are almost never shared, but we certainly have PBX customers who put multiple companies on a single PBX.

    This is why Elastix was moving away from the PBX model to the multi-tenant model. The core FreePBX based Asterisk system they had was never designed for multi-tenancy and people really wanted it. So many people outside the US use Elastix in this way and over come the shortcomings with various hacks and changes.

    I blame Elastix for the abandonment of the one model without anything solid working. I am sure it all comes down to money though. Elastix is owned by PaloAlto and they are a business. Business exist to earn money.



  • @scottalanmiller said:

    @IT-ADMIN said:

    and the IP Centrex is owned by the ISP and shared between multiple costumers, in this case the costumer pay for the service

    IP Centrex would be owned by the phone provider. No necessary connection to the ISP. I realize that in your country the ISP, phone provider, Centrex provider and many other functions are the same company and are actually the government so this gets blurry for you. But as IT terms go, ISP is not in use here.

    yeah you are right it is All in one :wink:


  • Service Provider

    In the US, and in most of the world, your phone company, ISP, Centrex providers, PBX providers, power company, etc. are all independent of each other so there is a lot more flexibility.



  • @scottalanmiller said:

    In the US, and in most of the world, your phone company, ISP, Centrex providers, PBX providers, power company, etc. are all independent of each other so there is a lot more flexibility.

    yeah it is true, but small countries like qatar tend to gather many services in one unit, so that the country have control over everything,


  • Service Provider

    @IT-ADMIN said:

    @scottalanmiller said:

    In the US, and in most of the world, your phone company, ISP, Centrex providers, PBX providers, power company, etc. are all independent of each other so there is a lot more flexibility.

    yeah it is true, but small countries like qatar tend to gather many services in one unit, so that the country have control over everything,

    It's really just an extension of the government. Although little countries in Central America do not do that. The people would not stand for that down here. Freedom is a big deal here where they've actually fought outright with the US to be able to be free.



  • how do you see the charge, cheap or expensive ?? (sorry i didn't convert the exchange correctly in my previous post, it is 15 $ monthly per extension + one time payment for the installation 164 $)
    the voice gateway is in our premise but owned by the telephone company


  • Service Provider

    @IT-ADMIN said:

    how do you see the charge, cheap or expensive ?? (sorry i didn't convert the exchange correctly in my previous post, it is 15 $ monthly per extension + one time payment for the installation 164 $)
    the voice gateway is in our premise but owned by the telephone company

    We charge by capacity so it is completely different than with a Centrex system. We don't change by users or extensions since it is a true private PBX.


  • Service Provider

    @IT-ADMIN said:

    how do you see the charge, cheap or expensive ?? (sorry i didn't convert the exchange correctly in my previous post, it is 15 $ monthly per extension + one time payment for the installation 164 $)

    That price is pretty average from what I have seen similar services in the US.

    @scottalanmiller said:

    We charge by capacity so it is completely different than with a Centrex system. We don't change by users or extensions since it is a true private PBX.

    This is why I recommend this model for most people with more than a few phones. The exact number always depends on the true cost breakdown after phone bill analysis.



  • @scottalanmiller said:

    @IT-ADMIN said:

    how do you see the charge, cheap or expensive ?? (sorry i didn't convert the exchange correctly in my previous post, it is 15 $ monthly per extension + one time payment for the installation 164 $)
    the voice gateway is in our premise but owned by the telephone company

    We charge by capacity so it is completely different than with a Centrex system. We don't change by users or extensions since it is a true private PBX.

    What do you mean by capacity?


  • Service Provider

    @IT-ADMIN said:

    What do you mean by capacity?

    If you buy any normal server you get "capacity." The amount of "whatever you can do with the CPU, memory and disks" that you have. It's depending on your workload how much you are able to do with it.

    Same here. You get a private PBX. You can have thousands of extensions that never talk since they use no capacity. You can have X users on g.711a but fewer on g.726 as it uses more CPU, assuming that you are CPU bound. You can add features as you want, but don't run out of memory or whatever.

    Capacity in the most common IT server sense of the word.



  • @scottalanmiller said:

    @IT-ADMIN said:

    how do you see the charge, cheap or expensive ?? (sorry i didn't convert the exchange correctly in my previous post, it is 15 $ monthly per extension + one time payment for the installation 164 $)
    the voice gateway is in our premise but owned by the telephone company

    We charge by capacity so it is completely different than with a Centrex system. We don't change by users or extensions since it is a true private PBX.

    So explain how you bill this?


  • Service Provider

    @Dashrender said:

    So explain how you bill this?

    Super easy... it's a flat rate for a capacity level. Only one level is common as we never see customers go over it. Customers who want a live active/active failover system pay for two. Same as every server everywhere bills for capacity. Just opex, not capex. So same model as any cloud IaaS service, just monthly not hourly.



  • @scottalanmiller said:

    @Dashrender said:

    So explain how you bill this?

    Super easy... it's a flat rate for a capacity level. Only one level is common as we never see customers go over it. Customers who want a live active/active failover system pay for two. Same as every server everywhere bills for capacity. Just opex, not capex. So same model as any cloud IaaS service, just monthly not hourly.

    Frankly I was hoping to see some numbers.

    Something like...
    for 1-10 lines we charge X per line
    for 10-50 lines we charge y per line
    etc.
    DIDs are z more per month, etc.


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