IP Telephony and Phones

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I am working with a network phone system running CUCM 10, alongside CER and some other similar systems. Inside the phone network, calls to 911 are failing. The caller gets a rapid busy signal when they try. I can see the attempts in the CER call hist...

Hello guys I try to registering 7912 G as sip phone to CME, I changed the firmware to sip but it doesn't registering to CMEip dhcp pool VOICnetwork 192.168.100.0 255.255.255.0default-router 192.168.100.1option 150 ip 192.168.100.1!!!ip cefno ipv6 cef...