350-801 · Question #343
An engineer builds this configuration on a Cisco IOS gateway for fax dial-peers: Which command is required to complete the configuration?
The correct answer is D. Codec g711ulaw. For reliable fax transmission over IP using a Cisco IOS gateway, it is essential to select a high-quality, uncompressed codec. This ensures the integrity of the fax signal and prevents transmission failures.
Question
An engineer builds this configuration on a Cisco IOS gateway for fax dial-peers:
Which command is required to complete the configuration?
Exhibit
Options
- ACodec g726r32
- BCodec g729cr81
- CCodec g723ar63
- DCodec g711ulaw
How the community answered
(37 responses)- A5% (2)
- C3% (1)
- D92% (34)
Why each option
For reliable fax transmission over IP using a Cisco IOS gateway, it is essential to select a high-quality, uncompressed codec. This ensures the integrity of the fax signal and prevents transmission failures.
G.726 is a compressed audio codec suitable for voice, but it will likely cause issues with fax transmission due to its compression.
G.729 is a low-bandwidth, compressed voice codec that introduces too much distortion for reliable fax signals.
G.723.1 is a very low-bit-rate voice codec and its aggressive compression algorithm is incompatible with fax data.
Fax transmission is highly sensitive to compression, packet loss, and delay, making uncompressed codecs like G.711 (ulaw or alaw) the preferred choice. G.711 preserves the fidelity of the fax tone, allowing successful modem negotiation and data transfer.
Concept tested: Cisco IOS gateway fax codec configuration
Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/7x/uc7x_srnd/gateways.html#wp1091219
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