A customer needs to configure a CAS E&M circuit that will support inbound and outbound DNIS and inbound ANI. Which configuration will accomplish this task?
A.
pri-group timeslots 1-24
B.
ds0-group 0 timeslots 1-24 type none
C.
ds0-group 0 timeslots 1-24 type e&m-fgd
D.
ds0-group 0 timeslots 1-24 type fgd-eana
E.
ds0-group 0 timeslots 1-31 type r2-digital r2-compelled ani
Explanation:
To define T1 channels for compressed voice calls and the channel-associated signaling (CAS) method by which the router connects to the PBX or PSTN, enter the ds0-group controller configuration command. Below is the syntax of this command:ds0-group ds0-group-no timeslots timeslot-list type {e&m-immediate | e&m-delay | e&m-wink | e&m-fgd | fgd-eana}
Description
(Reference: http://www.ciscosecure.net/en/US/docs/ios/12_1/12_1xd/feature/guide/hdv_fgd.html)T1 CAS always provides the ANI/DNIS delimiter on incoming T1/CAS trunk lines. The customer wants E&M circuit so the answer should be C.
Notice:
+ CAS signaling main feature is its use of user bandwidth to perform signaling functions. CAS signaling is often referred to as robbed-bit-signaling because user bandwidth is being robbed by the network for other purposes.
+ E&M signaling is typically used for trunks. It is normally the only way that a central office (CO) switch can provide two-way dialing with direct inward dialing.
+ ANI Automatic number identification. SS7 (signaling system 7) feature in which a series of digits, either analog or digital, are included in the call, identifying the telephone number of the calling device. In other words, ANI identifies the number of the calling party.
+ DNIS Dialed number identification service, also known as the called party number. The telephone number of the called party after translation occurs in the Public Switched Telephone Network. A given destination may have a different DNIS number based on how the call is placed (for example, 800 or direct dial).
