Mixing different manufacturers IP phones on a Mitel VOIP network

I am going to be implementing a Mitel 3300 switch, and am looking into IP phones. Our vendor is telling us we can't use anything but Mitel, but I thought protocols were standardized so any IP phones would work. Is this not correct?



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IP "phones" are really built in ATA (analogue telephone adapters), and different systems use different protocols. Of course they want to sell you their brand of h/w, but if you ever want to dial someone who does NOT have an IP phone, you'll have to use your vendor's systems.

Reply to
Rick Merrill

snipped-for-privacy@nospam.com wrote in news: snipped-for-privacy@4ax.com:

Nope, VoIP is a generic term to mean that voice data is sent over an IP network. There are several propreitary VoIP protocols. If you want an open standard, ensure that your system supports SIP. SIP protocol is supported by most Internet VoIP systems.

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!!!!!!!!!!!! No they are not............. They are Digital phones that use an IP protocol n the case of Mitel sets its Minet.


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You are defining it in a equivalent way: An ATA just runs a analog to digital conversion for analog phones. Your "digital" phones convert analog voice directly to digital. six of one, half a dozen of the other, or whatever makes you happy.

Reply to
Rick Merrill

There is a very important difference. ATA's use ratty old 4-wire to

2-wire hybrids which mix the incoming and outgoing signals together. The phone then uses another hybrid to un-mix those two signals. The result is two echo-inducing, frequency response limiting hybrids in your talk path.

A real voip phone has no such nonsense. In fact some of them (at least the ones that do g.722-wideband) probably even have earphones and mouthpieces rated to twice the normal phone frequency response. There is a noticeable improvement in the sound quality. Of course, it is only usable when talking between two phones that can do similar wideband speech.


Reply to
Wolfgang S. Rupprecht

No, an ATA, is a specific device to connect a POTS telephone (more likely a fax machine/modem/coin operated phone/etc) to a VOIP network.

All that is required is that the phone and PBX understand the same protocol. Which is only likely to be the case if the latter only speaks some proprietary protocol.

Either the phone will work or it won't. Connecting to a non IP phone involves a PSTN interconnect somewhere. But that could be anywhere on the planet.

Reply to
Mark Evans

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