Exam 350-801 topic 1 question 90 discussion

It's B and E. This can only be done by using DSPs. Hardare MTP and Transcoder through a router. CUCM doesn't have a software transcoders so for sure A cannot be the answer. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab10/collab10/media.html#77886

D and E While a transcoder could work, MTP is sufficient and the better answer. CUCM and IOS have MTP resources, but IOS can only handle transrating when using DSPs (which would be configured as a hardware MTP).

I Agree A & D

As indicated in SRND collaboration 12.X, it's B and E. This can only be done by using DSPs. Hardare MTP and Transcoder through a router. "When Cisco IOS MTP resources are invoked by Unified CM for a call flow, a software session rather than a hardware DSP session is consumed unless the media legs of the call flow require transrating. Thus, for flows invoking an MTP, a DSP session is used only when transrating (conversion between media legs with the same codec but different packetization times) is required." https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab12/collab12.pdf

The correct answer is BD. Software MTP on CUCM, and Hardware transcoder on Cisco IOS Software.

DE. Repacketization needs a DSP and cannot be done by software only. this means its obviously E on iOS, but also D, because on CUCM a hardware MTP is also refered to as a software MTP (https://www.cisco.com/c/en/us/td/docs/ios/voice/cminterop/configuration/guide/15_1/vc_15_1_book/vc_enh_confr_vgr.html) The following MTP resources are supported for Cisco Unified Communications Manager 4.0 (formerly known as Cisco CallManager 4.0) and later releases: •Software MTP—Software-only implementation that does not use a DSP resource for endpoints using the same codec and the same packetization time. •Hardware MTP—Hardware-only implementation that uses a DSP resource for endpoints using the same G.711 codec but a different packetization time. >>>> >>The repacketization requires a DSP resource so it cannot be done by software only. Cisco Unified Communications Manager also uses the term software MTP when referring to a hardware MTP. <<<<<<

B and E. Eventhough both endpoints use G711ulaw/alaw the sampling is different (20 and 30 ms). So in order for this to work a hardware IOS MTP will be required. An IOS transcoder can also do that.

Based omen the below I'd say B D https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab10/collab10/media.html A transcoder is a device that converts an input stream from one codec into an output stream that uses a different codec. Starting with Cisco IOS Release 15.0.1M, a transcoder also supports transrating, whereby it connects two streams that utilize the same codec but with a different packet size. An MTP can be used to transcode G.711 a-law audio packets to G.711 mu-law packets and vice versa, or it can be used to bridge two connections that utilize different packetization periods (different sample sizes).

I would say that the answer is B and E •Software MTP—Software-only implementation that does not use a DSP resource for endpoints using the same codec and the same packetization time. •Hardware MTP—Hardware-only implementation that uses a DSP resource for endpoints using the same G.711 codec but a different packetization time. The repacketization requires a DSP resource so it cannot be done by software only. Cisco Unified Communications Manager also uses the term software MTP when referring to a hardware MTP. https://www.cisco.com/c/en/us/td/docs/routers/access/vgd1t3/rel1_0/software/configuration/guide/VGD_transcoding.html

For packetization you need MTP. Hence C & D. There is no hardware MTP on CISCO IOS, So E is incorrect. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab10/collab10/media.html#67911

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/11_5_1/sysConfig/CUCM_BK_SE5DAF88_00_cucm-system-configuration-guide-1151/CUCM_BK_SE5DAF88_00_cucm-system-configuration-guide-1151_chapter_01000010.html A and D is correct