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TP3057, TP3155

Dear all, i have design with with TP3057 codec, actually my requirement is something like pbx system, there an anther ic i checked that is TP3155 time slot assignment for codec, and it shows we can connect multiple codec in a two wire system, here i am using these codec are for different channels of EPBX  system, then how can i access the particular channel from a two wire system which connected the all Dx and Rx ( TRANSMITTER and RECEIVER pin of all the codecs). is it necessary to use any other communication protocol like CAN, I2C, If it is necessary how will i implement... PLEASE HELP ME I AM A BEGINNER IN HARDWARE DESIGN, ANYONE PLZZ HELP ME