Which IP/PBX systems can support Cisco IP Phones with SIP Enabled?

Hello all.

We currently have a hosted VoIP system using Cisco phones that are SIP enabled.

We want to go back to PBX systems so I was wondering do you know of any PBX systems that will support the Cisco IP phones?

I know Asterisk does, how about some of the other mainstream guys like Shoretel or Mitel?

Thanks!!
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carpetflyerAsked:
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shepimportCommented:
Shoretel does some support though there is minimal SIP support at the monment... Mitel... is in the same class... You can use any PBX that supports SIP or MGCP signalling but, recognize that...     If it does not suport SIP trunking you will need to order POTS/T1/E1 lines to terminate your calls... or you may want that
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tim1731Commented:
Weltech,
Worth a look at the Snom software PBX as it does

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artietscCommented:
Take a look at the Interactive Intelligence (I3) line of products at www.inin.com.  You would most likely have to invest in some hardware and implementation for a SIP deployment.. but I3 does a good job at IPT.
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jfradyCommented:
The 3Com VCX/NBX does.
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carpetflyerAuthor Commented:
Thanks for the response guys.  I talked to Shoretel and they said they do support SIP phones but only 7-8 basic functions.

I will give you a heads up on what I come across.
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mattlandisCommented:
Hello,

Take a lot at the windows based ip pbx call 3cx.

tx
matt

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