Learn About Implementing Cisco IOS Unified Communications
By Certification Magazine —
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A. sip-notify.
B. rtp-nte.
C. info-notify.
D. sub-notify.
Answer:
C
Tutorial:
The info-notify option is not a dtmf-relay command option. Dual-Tone Multifrequency (DTMF) dialing consists of simultaneous voice-band tones generated when a button is pressed on a telephone. The use of DTMF signaling enables support for advanced telephony services. For devices that utilize these features but may not support media connections, the DTMF Events through SIP Signaling feature provides this signaling capability.
The Media Termination Point (MTP) or transcoding module on a gateway detects RFC 2833 (DTMF) packets from an IP endpoint and can be instructed to generate and send out-of-band signal events to the call manager or to pass the packets through to the other IP endpoint, which is the default behavior. This is accomplished with the dtmf-relay command.
There are four options for the dtmf-relay command:
• info
• rtp-nte
• sip-notify
• sub-notify
The dtmf-relay info command sets the Session Initiation Protocol (SIP) Dual Tone Multifrequency (DTMF) relay mechanism by using Info messages to relay outgoing DTMF signals from Cisco Unity Express to the Cisco IOS SIP gateway.
The dtmf-relay rtp-nte command sets the SIP DTMF relay mechanism to use the media path to relay incoming and outgoing DTMF signals to Cisco Unity Express.
The dtmf-relay sip-notify command sets the SIP DTMF relay mechanism to use Unsolicited-Notify messages to relay incoming and outgoing DTMF signals.
The dtmf-relay sub-notify command sets the SIP DTMF relay mechanism to use Subscribe and Notify messages to relay incoming DTMF signals to Cisco Unity Express.
The other options are incorrect because rtp-nte, sip-notify and sub-notify are all valid options of the dtmf-relay command.
Reference:
Cisco > Cisco Unity Express 3.1 Command Reference - D [Cisco Unity Express] > dmtf-relay
Objective: Implement Cisco Unified Communications Manager Express to support endpoints using CLI.
Sub-objective: Describe the requirements and correct settings for DHCP, NTP and TFTP.
Single answer, multiple-choice
What is the function of the configuration file stored on the Trivial File Transfer Protocol (TFTP) server in a Cisco Unified Communications Manager Express (CME) environment?
A. It provides information about voice VLAN to the IP phone.
B. It provides an IP address to the IP phone upon request.
C. It provides firmware images while booting the IP phone.
D. It provides parameters for connecting the IP phone to Cisco Unified Communications Manager Express.
Answer:
D
Tutorial:
The configuration file provides parameters for connecting the IP phones to Cisco Unified Communications Manager Express. Each Cisco IP phone contacts the TFTP server and downloads a configuration file after receiving the server's address via option 150, which is included in the Dynamic Host Configuration Protocol (DHCP) server's scope options. The configuration file stored on the TFTP server provides parameters to establish connectivity with CME. After receiving the file, the IP phone tries to make a TCP connection to the Cisco Unified CME router.
The configuration file does not provide information about voice VLAN to the IP phone. The switch provides VLAN information to the IP phones, such as the VLAN number.
The configuration file does not provide an IP address to the IP phone upon request. IP addresses are provided by the DHCP server.
The configuration file does not provide firmware images while booting the IP phone. The firmware images are stored inside the non-volatile flash memory.
References:
