I am part of the CUCM TAC team and please bear with me as I do not handle much of the networking/switching aspect and really have no clue when it comes to the switches I am asking about.
I've done some research and I can only find documentation regarding additional settings within multicast for the SG200-50 and the SR2024 switches. Do these switches inherently support multicast or is there configuration necessary to turn multicast on? Where can I find documentation on setting up basic multicast ability?
A bit of back history, I have a case with a customer using Informacast Paging service. Informacast utilizes a multicast stream and we can't seem to validate the stream beyond the Informacast server. This leads me to believe that multicast is not enabled on the devices and therefore the phones are not receiving multicast.
Any assistance is greatly appreciated. Thanks in advance
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The security error references an issue with the CTL or ITL the phone retrieves. When a phone registers, it will first request the CTL. If that does not exist, it will request the ITL. If neither of those exist the phone will reach out to TVS for verification. For the sake ease, we'll discuss as though the phone is having ITL issues (as CTL is for secure registration) If the phone's ITL does not match the ITL on the TFTP, it will then need to reach out to TVS for verification of trust. If the phone's current ITL has different TVS information than what's contained on the cluster, then the phone can never get verification of an ITL and will receive a security error. Most often, the simplest workaround to this issue is to manually remove the ITL from the device. However, if you want to get further into troubleshooting, you can compare hash values of what the phone has to what the phone is being sent via TFTP.
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