We have the same need, call recording for internal clients. Mirroring many ports to one for me is a workaround not a solution unfortunately. Every desk setup consist in one lan port connected to an ip-phone and a thin client or a PC is daisy chain throught the phone to get connected to the network. Mirroring all the ports will result in mirroring lots of unwanted traffic from many Vlans. We are currently using a 2960x (2 of them in stack) to mirrror the Voice Vlan for recording purpose, very annoying since that is the only non-meraki device in the network and is sitting between the access and the core switches, I have already "made a wish" with Meraki to introduce this functionality in the future if you are interested please do the same 🙂
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