The commini setting sets the characteristics of the comm port. The settings are in a comma separated sequence and refer to the port speed, parity, data bits, stop bits.
For example, a commini setting of '9600,N,8,1' means a speed of 9600bps, no parity, 8 data bits, 1 stop bit.
Cisco router consoles are configured to use 9600,N,8,1 by default. Some PBX equipment may only support 1200 bps with 7 bit even parity, so the commini setting of 1200,E,7,1 should be used.