Q: 11
Refer to the exhibit. Which two codec permutations should be transcoded by this dspfarm? (Choose two.)
Options
Discussion
I don’t think it’s A or B since those codecs aren’t even in the profile. From what I remember, DSPFarm can only transcode between the codecs it's configured for, so C and E fit. iLBC and G.728 are a trap here because they’re missing from the codec list.
A makes sense here. UCM sits in the middle and relays SIP messages between both phones, so you get duplicates for each signaling leg in the trace. Not 100% but that's what I've seen in practice.
Option C and E
C or D, can't tell for sure without seeing the exhibit but both of those look possible if we just go by the codecs mentioned in most configs. Kinda depends on the dspfarm profile.
Isn't this a bit tricky if you misread which codecs are actually registered in the dspfarm profile? If iLBC or G.728 aren't in the list, A and B can’t work at all even though they sound valid.
A imo. UCM acts as the intermediary SIP user agent, so it sends the messages between endpoints and you’ll see two of each in the trace. It’s basically relaying the 180 Ringing and BYE on both legs. Pretty sure this is right, anyone disagree?
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