You are working with a potential customer that would like to integrate its existing PBX telephone system into its IP network. The accompanying figure shows that the customer has two offices that need to be connected to the IP network so that the customer can exchange telephone calls without using the PSTN.
Both PBXs are currently connected to T1 ISDN circuits.
Which signaling type will allow your to support your customer?
A.
QSIG
B.
CCS
C.
CAS
D.
T-CCS
E.
E&M
F.
FXO