Help to choose router model

Hi,
We want bo buy miktorik router, but we don’t know which model we need?!

In our case, router is uses for routing SIP traffic.
We have from 50 to 200 calls at same time in our office.
Each sip call is 64 kbit for upload and download.

Count of devices in the office is 60, but we plan to increase it to 100 devices (PC, 10-15 SIP servers, SIP phones).

Could you reccomend any mikrotik router for such purpose?

Thank you

any device will handle the bandwidth, so the choice is more for the size, number of ports and connections (do you need wireless etc)

RB951Ui is the best

Thank you for answer.

Now we have got Zyxel Keenetic Giga II, it has mostly same characteristics as MikroTik RB951Ui-2HnD, but process load is jump to 50% sometimes and calls brokes sometimes. In sessions tab I see near 600 or more active sessions.
So, we worry about stability.