You issue the show running-config command on a CME router and receive the following partial output:
Examine the output, and use the information you gather to answer the question.
Which of the following statements is true? (Select the best answer.)
A.
There will be no delay after the phone number is dialed.
B.
There will be no dial tone on the voice port.
C.
There will be an IP conflict between the CME router and an IP phone.
D.
Only the first dialed digit will be matched.
Explanation:
There will be no dial tone on the voice port, because the dial peer has been configured with the directinwarddial command. The directinwarddial command and the shutdown command can both disable dial toneson a voice port. You should issue the directinwarddial command on a plain old telephone service (POTS) dial
peer to enable direct inward dialing (DID) for an incoming number. DID uses the incoming dialed number to
match an outgoing dial peer. For example, you can use DID to map a POTS telephone number to a fourdigit
extension on a Voice over IP (VoIP) network so that callers from POTS numbers can bypass the automated
attendant or menu system and reach the internal VoIP extension directly. When DID is enabled on a POTS dial
peer, the caller will not hear a dial tone on the voice port that is associated with that dial peer.
If you issue the shutdown command on a voice port, the port enters the shutdown state, meaning that no voice
or data packets can traverse the port and, therefore, no dial tone can be heard by a caller who is attempting to
place a call on the port. You can reenable a voice port by issuing the no shutdown command in interface
configuration mode.
If you do not hear a dial tone on an IP phone even though directinwarddial has not been configured on the dial
peer and the no shutdown command has been issued on the voice port, it is probable that you have not
assigned an ephonedn to the line that is associated with the IP phone. You can assign a directory number (dn)
to an IP phone in Cisco Unified Communications Manager Express (CME) by issuing the button buttonnumber:dntag command in ephone configuration mode, where dntag is the number that has been assigned to
the ephonedn and buttonnumber is the number of the line button on the IP phone to which you want to
associate the dn. In this scenario, the ephonedn 50 has been assigned to button 1 on ephone 20.
There will be a delay after the phone number is dialed. In addition, up to 32 digits will be matched by the
destination pattern, not just the first digit. The dial peer command destinationpattern .T is used to indicate any
string of up to 32 digits. The T character is used at the end of a string to instruct the router to wait for the
complete dial string to be entered before matching a call to a dial peer. Cisco recommends that you use the
destinationpattern .T command rather than the destinationpattern T command because the destination-pattern
.T command requires that the caller dial a digit. A dial peer with the destinationpattern T command will be
matched if an outbound caller takes the phone offhook for 10 seconds. Destination patterns that do not use the
T wildcard do not experience a delay between the completion of the dialed string and the connection of the call;
the dialed string is matched on a digitbydigit basis, and the call is connected as soon as a match is found.
There will not be a conflict between the CME router and an IP phone. The following commands configure the
router with a Dynamic Host Configuration Protocol (DHCP) pool that will be used to assign IP addresses to an
IP phone:
ip dhcp pool IPPhones
network 192.168.14.0 255.255.255.0
default-router 192.168.14.1
In addition, the ip address 192.168.14.1 255.255.255.0 command configures the FastEthernet 0/0 interface on
the CME router with the IP address 192.168.14.1. In addition, the ip dhcp excludedaddress 192.168.14.1
192.168.14.9 command prevents the CME router from assigning the IP address 192.168.14.1 to an IP phone.https://www.cisco.com/en/US/docs/ios/12_3/vvf_r/
vrg_d1_ps1839_TSD_Products_Command_Reference_Chapter.html#wp1289151
https://www.cisco.com/c/en/us/support/docs/voice/h323/22372-no-dialtone.html#solution5