Which two sources contribute to H.323 network voice transmission delays?

The correct answer highlights two critical factors that contribute to delays in H.323 network voice transmission: compression delay and DSP delay.

Compression delay arises when voice data is compressed to reduce bandwidth usage. The time taken to encode and decode audio can introduce a significant delay, especially if the compression algorithm is complex. As voice packets are processed, if there is a considerable amount of data to encode, this can slow down the transmission speed, impacting real-time communication.

DSP delay refers to the time taken by Digital Signal Processors to process the audio signals. When audio data is digitized, it must be manipulated and converted for transmission and reception, which takes time. The efficiency and speed of the DSP can significantly affect how quickly audio is transmitted over the network.

In contrast, the other choices reference factors that, while they may influence the quality and performance of a voice network, do not directly refer to the intrinsic delays caused by the processing and encoding of voice data during transmission. Latency and jitter primarily refer to variations in signal delivery and not necessarily the processing of voice data. Packet loss concerns the loss of voice packets rather than the time it takes to encode them, and network congestion relates to overall network traffic rather than specific processing delays. Echo delay is also related to