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MCU can't register to Brekeke SIP server

Publication Date:  2014-07-14 Views:  68 Downloads:  0
Issue Description
custom feedback, MCU can't register to the brekeke SIP server. 
Alarm Information
none
Handling Process
1. check the paramters at MCU and SIP server
all the same
2. add the MCU at SIP server side.
the problem still exist.
3. capture the packet at SIP server side.
server already receive the register information from MCU . but server didn't feedback .
4. disable the firewall of the server.
problem still exist
5. check the logs of the SIP server.
show : the IP was blocked.
6. check the block list of SIP server.
somebody add the IP of MCU to block list.
Root Cause
somebody add the MCU's IP to block list.
Suggestions
step by step to find the signal flow.

END