多項選擇題

Refer to the exhibit. The Greene Supply Company is integrating Cisco Unified CallManager Express into a SIP network. Which two statements are accurate?（）

A.SIP support in dial peers is a Cisco IOS function. 
B.Use the notify-based DTMF relay mechanism that is proprietary to Cisco.
C.SIP support in Cisco IOS is a function of localized call processing integrated with Cisco Unity Express. 
D.Use either the notify-based DTMF relay mechanism that is proprietary to Cisco or the RFC-based DTMF relay. 
E.The SIP server must be configured for the E.164 numbers that are going to register with the Cisco CallManager Express database.  


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1.單項選擇題Which statement best describes echo?（）

A.Echo is the discernable leak-through of your own Rx path into your own Tx path. 
B.Echo is the discernable leak-through of the packets of your Rx path into your own Tx path. 
C.Echo is the nonaudible leak-through of the packets of your Rx path into your own Tx path. 
D.Echo is the audible leak-through of the packets from the transmit path into your own receive path. 
E.Echo is the nonaudible leak-through of the packets of your Tx path into your own Rx path.

2.單項選擇題

Refer to the exhibit. The Hamilton Hair Emporium was having difficulty hearing during conference calls. This configuration adjustment was made, and now the company is experiencing sound distortion. What is the cause?（）

A.The gain functionality applies to outbound audio packets. Distortion is created when an external participant causes echo. 
B.The distortion is unrelated to the gain functionality. Rather, it is a result of the company trying to maintain too many conference calls at one time. 
C.This functionality cannot discriminate between a local VoIP source that requires volume gain and a CO-powered PSTN source that does not require volume gain. 
D.This functionality cannot discriminate between a remote VoIP or Foreign Exchange Office source that requires volume gain, and a remote VoIP or IP phone that does not require volume gain.