I have just recently installed a BCM 450 licensed for 50 IP extension.I have truned on autoassigned DN,but when it reached 20 extension it stop assigning extenson and reports no more auto extension available.
Check telephony resource and see how many extn numbers you assigned to the ip phone range.
you need to tell the system how many ip phones extn numbers you want and set the range.
You can have up to 300 numbers.
On default its usually 16 extns assigned
You need to deconfigure and reconfigure the ip range to allow for more ip phones ,say 200
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