[cisco-voip] How does voice recorder works? Do I need RSPAN or ERSPAN?

[Ki Wi]

I have a setup with 2 DC . There's couple of voice gateway and cucm in each
DC.

There's a couple of distribution switches as well.

Between 2 DC and distribution switches are all L3.

Today, my requirement is only to span a few ports connected to the access
switches of distribution switch "A". If I do a rspan from those IP phones
back to distribution switch "A" and I will connect the voice recorder to
distribution switch "A", will it work?

Is it neccessary for me to span the traffic from cucm and voice gateway as
well? If so, ERSPAN is required.
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