cisco UC500 VS Asterisk

we currently have a PRI with ATT and a UC560. we are having issues now that we are opening 2 offices in different cities. we will like to use the same phone system Cisco UC560 but I am not sure it will do the job. I was thinking on switching the UC560 to a Asterisk. I have been told that asterisk has more features for remote locations. the phones we have are Cisco IP phones 7945, will the phones be able to work with asterisk.
Enrique CebalosIT ManagerAsked:
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Bryant SchaperCommented:
Phones will probably work, but you lose features, Cisco uses SCCP while Asterisk will use SIP.  Many of the "cool" features are in the proprietary language of the phone vendors.

Looks like the UC5xx are discontinued, can you outline your requirements?  I know Asterisk is free, but I prefer support from a vendor and the carrier when it comes to my phones.  Not worth putting your job on the line if it fails.

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José MéndezCommented:
Bryant has a point here. Asterisk is feature rich, that does not mean the user experience is 100% joy.

For example, Cisco phones use XML configuration files to behave certain way or the other. The fabrication of those files is tiresome if you plan to do it manually. The Callmanager express inside the UC500s kind of alleviates that part.

Another thing is that Cisco Phones are designed to invoke features through Softkeys, and when using SIP, features are communicated in proprietary messages difficult to program in Asterisk. So you are left with Asterisk's way of invoking features: DTMF tones.
Enrique CebalosIT ManagerAuthor Commented:
thank you
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