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Is there any way to make the 9630 Desktop Headset work just as a SIP IP telephone, without the extensive need for additional Avaya equipment. All of our infrastructure is Cisco and we may receive about 80 Avaya deivces and I am wondering if they would work just as an IP telephone, without any additional hardware from Avaya or messing with the configuration of the Cisco devices.

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Yes, they do support SIP, there is extensive documentation on about the firmware:

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