Phone not registering after standard troubleshooting steps
SIP phones communicate with our Registration Server (NDP) server using the UDP (User Datagram Protocol ) protocol. I have found that, in 2 different locations of one of our clients, the phones won't register with this standard type of protocol connection.
I tried Factory Resetting the phone and Auto-Provisioning them manually, upgrading the firmware, with no results. The phone still had No Service.
When running the SIP-ALG detector, I noticed something out of the ordinary. It says that SIP ALG is not detected on TCP but the SIP ALG on UDP is not found or has some type of error. This means that if the phone is using UDP for communication, it won't register with our server.
The solution is going to the client extension in the Voiceware Manager Portal --> Phone Hardware, then editing the phone using the pencil to the right of the MAC Address, accessing Advanced Tab View, and changing Transport Method to TCP.
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