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Simple Answer: No. the i2004 uses the proprietary nortel UNISTIM protocol. Asterisk uses SIP, IAX, SCCP, H.323, but not UNISTIM.

Complex answer: It depends on how much you really want it. There has been an open-sourced implementation of a UNITSTIM server done by Cedric Hans. It is located at http://www.mlkj.net/UNISTIM/voi.tar.bz2 (Note: I have not tried it myself yet). With some work it could be modified

Yup, it works. I took a copy of voi to our local Nortel distributor's office and showed their engineers how their phones can be used without their call server.


Honestly, I'm not sure if chan_unistim makes much sense.
a) The phones aren't cheap - over here they cost as much as Cisco 7940's.
b) Nortel is already going to SIP. Their latest switches all support SIP. I guess in the end they might produce firmware to upgrade the i2004 to SIP.
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