An administrator deployed a third-party H.323 gateway in a voice environment, but users report call failures when using features like call hold or call transfer. What are two reasons that these features fail? (Choose two.)
A.
The CSS of the transfer initiating line does not contain the partition of the supplementary feature extension (DirectTransfer or MoH Number).
B.
The MTP that is configured for use within the H.323 gateway configuration is configured as a trusted source, but the third-party gateway does not trust the signing root CA certificate of the MTP certificate.
C.
The MTP does not support the negotiated codec, and media renegotiating during the call is not supported.
D.
The Media Resource Group List of the H.323 gateway contains only transcoders and conference bridges but no MTP.
E.
The third-party gateway does not support supplementary features, so Media Termination Point (MTP) must be inserted.
D. The Media Resource Group List of the H.323 gateway contains only transcoders and conference bridges but no MTP.
Call transfer and hold require Media Termination Points (MTP) when dealing with H.323 gateways that do not support supplementary services.
If the Media Resource Group List (MRGL) only contains transcoders and conference bridges but lacks MTPs, CUCM cannot handle call signaling properly, causing the failure.
E. The third-party gateway does not support supplementary features, so Media Termination Point (MTP) must be inserted.
Many third-party H.323 gateways do not support H.450-based supplementary services (which are required for hold, transfer, and other features).
In such cases, CUCM must insert an MTP to handle these features via SCCP/H.323 signaling.
D and E would make sense to me as an MTP is needed for H323 version 1 gateways
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