have an Cisco MC3810 router with 4 E&M analog interfaces ( Type 5 - 4 wire ) that are connected to an PBX and are configured for use in a VoFr connection.
Is it possible to configure a connection like this ( VoFr) changing the 4 E&M analog interfaces to an E1 controller ?
Yes, but if I am not mistaken, the 3810 only supports E1 QSIG. I am not sure if it supports E1 R2 now, you might need to use a different platform. Check the IOS release notes for the 3810.
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