Endpoint A is attempting to call endpoint B.
Endpoint A only supports G.711ulaw with a packetization rate of 20 ms, and endpoint B supports packetization rate of 30 ms for G.711ulaw.
Which two media resources are allocated to normalize packetization rates through transrating? (Choose two.)
Click on the arrows to vote for the correct answer
A. B. C. D. E.AD.
When two endpoints with different codec and packetization rates are involved in a call, media resources such as transcoders and media termination points (MTPs) can be used to normalize the media streams between them. In this scenario, Endpoint A only supports G.711ulaw with a packetization rate of 20 ms, while endpoint B supports packetization rate of 30 ms for G.711ulaw. Therefore, two media resources are needed to normalize packetization rates through transrating.
Option A: Software transcoder on Cisco UCM Cisco Unified Communications Manager (UCM) provides software-based transcoding resources that can be used to convert one codec to another, change the packetization interval, and adjust other media parameters. In this case, a software transcoder on Cisco UCM can be used to transcode the media stream from endpoint A to G.711ulaw with a packetization rate of 30 ms, which can then be sent to endpoint B without the need for further normalization.
Option B: Hardware transcoder on Cisco IOS software Cisco IOS software can also provide hardware-based transcoding resources through the use of specialized DSP modules on routers or switches. In this case, a hardware transcoder on Cisco IOS software can be used to transcode the media stream from endpoint A to G.711ulaw with a packetization rate of 30 ms, which can then be sent to endpoint B without the need for further normalization.
Option C: Software MTP on Cisco IOS software A software MTP on Cisco IOS software can be used to normalize the media streams between endpoints with different codec or packetization rate, but it is not recommended for this scenario because it can introduce additional delay and jitter in the media streams. Moreover, software MTPs are not designed for transrating, which involves changing the packetization interval.
Option D: Software MTP on Cisco UCM Similar to Option C, a software MTP on Cisco UCM can be used to normalize the media streams between endpoints, but it is not recommended for this scenario because it can introduce additional delay and jitter in the media streams. Moreover, software MTPs are not designed for transrating.
Option E: Hardware MTP on Cisco IOS software A hardware MTP on Cisco IOS software can be used to normalize the media streams between endpoints with different packetization rates, but it is not recommended for this scenario because it is an overkill solution for the requirement of transrating a single codec. Moreover, hardware MTPs are more expensive and resource-intensive compared to software-based solutions.
In summary, the best options for normalizing packetization rates through transrating for this scenario are Options A and B, which involve using software or hardware-based transcoders respectively.