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all ipphone can not register to U1980

Publication Date:  2013-07-25 Views:  86 Downloads:  0
Issue Description
all ipphone can't call out ,and we found that the register is all fail .
Alarm Information
no alarm ,from the signaling we got from site ,when ipphone start to register ,no response from U1980 .
Handling Process
1.check the status of U1980 ,it was running well .

2.check the network between ipphone and U1980 ,it's ok .

ask customer what happyed this morning ,customer said they modify some port in firewall ,which just between the ipphone and U1980 ,after check the firewall ,we found that the port 5060 is forbidden .open the port ,all register restore.
Root Cause
only 2 reason can cause the issue
network problem.
U1980 is down.
5060 is the default port for sip call ,can't forbidden .