Cvocie question 75

Which type of voice port will be most cost effective to allow the gateway to terminate two circuits from the PSTN or a PBX?

A. FXO
B. FXS
C. PRI T1
D. E1
E. E&M
F. BRI
G. CAS T1
H. E1



Answer: E

Explanation

For PSTN and PBX connection, we need to use an analog interface type. E&M signaling is designed to connect directly to a PBX system that also supports E&M interfaces. Many PBX brands have E&M analog trunk cards that can operate as either the trunk circuit side or the signaling unit side and Cisco gateway does support E&M interfaces.