I have a STE analog secure phone which is connected to a analog voice gateway vg248 and CUCM 7.1.5 using mgcp. When opening a secure line it disconnects after about 30 seconds, but non-secure works fine. Configuration appear to be in order (v150 option checked also). What could be missing here? I am at a loss and I am not well versed in the secure communication settings for these phones. I could use a configuration example that is currently working for another colleague if possible. Could it also be a config issue on the analog voice gateway and/or voice router?
