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Register Unregistered Phone after 120 sec after subnet mask change

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fahad10

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Recently, due to shortage of IP addresses we had to change our network subnet mask from 24 to 22 - everything is working fine but phone is registering and unregistering

Restarted server several times no effect
gave phone static ip address no effect
reconfigure the extension no effect

kindly guide what to do ?
 
This may be a dumb question, but did you remember to reconfigure your DHCP scopes appropriately?
 
Does this affect other devices on the network ?

Within the phone web frontend, what is the server address - IP address or fqdn. If fqdn does this point to the correct internal IP address

Have you tried whitelisting your internal IP address range ?
 
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