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Problem registering IP Phones 6945

I was installing Cisco IP Phones 7945 and 6945 using CUCME 9.0 in a 2921 router. The problem is that the 6945 phones don´t register in CUCME; i have tried with SCCP and SIP with the same results. The firmware that the phones are using is 9-2-1-0. The IOS of the router is 15-2-4 universal. The 7945 phones register with no problems; the problem is only with the 6945 phones.               

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Hall of Fame Master

You can take "debug ephone register" with "term mon" to see what's happening.

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I issue the debug command and term monitor in the router. When I plug the phone, it doesn´t give me any result.

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Then you can take debug tftp events to see what happens before registration.

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