3845 and 2851 CME router FXS Versus T1 for legacy PBX

Discussion created by KamranRahman on Oct 21, 2009
Latest reply on Nov 25, 2009 by hfang

I am trying to decide for various PBX campuses there are 1, 2, 4, 5, 25, 100 and 200 analog phones system. For CME 2851 to interface which option would be better T1 or the FXS port. I understand we can use 4 FXS port for 4 phones tied to a PBX system, but at what number of legacy phones ( 4 and above)  one should consider T1 over the FXS port.

We need numbering scheme for various campuses to come up with FXS and T1 ports to support legacy systems.