John – how about that Windows-Thing on the screen? “Do you really want to SIP this Signal? Yes? No? Abbort?
Just kiddin´
Well, on a hardwarebasis, one could use two buttons instead of one – i.e. for SIP, you have to hold one of the softkeys on the right PLUS hit the PAFL of the desired channel.
Another way could be a complete SIP-Mode you have to activate for soundcheck. While this mode is active, the colorscheme on the Display an in the naming strip should be different. just slightly, but notable. Half on half instead of full Colors – as an example.
Any other ideas?