Which of the following is a function of MTPs?
A.
sampling, encoding, and compression of analog audio
B.
providing connectivity for SIP devices and H.323 devices
C.
converting digital audio from one codec to another
D.
delivering SIP Early Media Offers over SIP trunks
Explanation:
Delivering Session Initiation Protocol (SIP) Early Offers over SIP trunks is a function of Media Termination
Points (MTPs). There are two ways to enable Early Offers on SIP trunks in Cisco Unified Communications
Manager (UCM): select the MTP Required check box on the SIP trunk or select the Early Offer support for
voice and video calls (insert MTP if needed) check box on the SIP profile that is connected to the SIP trunk. If
MTP is required, all outbound calls will use MTP, as will calls operating on the same codec. If MTP is enabled
as needed, it is inserted if the trunk is incapable of sending complete information about its media capabilities in
the SIP Invite message.
Converting digital audio from one codec to another is a function of a transcoder, not of MTPs. Transcoders
enable communication between devices that support dissimilar audio codecs. For example, a transcoder can
translate a G.729encoded packet to a G.711encoded packet and vice versa. Transcoders translate the data
stream in real time between two devices so that no audio delay is experienced by either endpoint.
Sampling, encoding, and compression of analog audio is a function of a digital signal processor (DSP), not of
MTPs. DSPs execute the steps required to convert an analog voice signal to digital packets, which allow voice
data to traverse a Voice over IP (VoIP) network. There are four steps involved in converting analog audio data
to digital audio data: sampling, quantization, encoding, and compression.
Providing connectivity for SIP devices and H.323 devices is a function of a UCM’s SIP trunks and H.323 trunks,
respectively, not of MTPs. UCM supports both SIP trunks and H.323 trunks.Cisco: Cisco Unified CM Trunks: Media Termination Points