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Quality of Service & Media Handling Flashcards

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  1. In AudioCodes Mediant, what is the purpose of configuring 'Media Realms'?

    Answer: To define the network interfaces and IP address ranges used for RTP media streams, enabling media routing across multiple NICs

    Media Realms specify which network interfaces and IP subnets are used for RTP media, allowing the device to correctly route media on the right interface in multi-homed deployments.

  2. What does 'Transcoding' mean in the context of an AudioCodes SBC or gateway?

    Answer: Converting media from one codec (e.g., G.711) to another (e.g., G.729) between two call legs

    Transcoding is the real-time DSP process of decoding incoming audio in one codec and re-encoding it in a different codec for the outgoing call leg.

  3. Which AudioCodes parameter sets the RTP port range used for media streams on a Mediant device?

    Answer: Base UDP Port (BaseUDPPort) and range size

    The BaseUDPPort parameter combined with the configured range size defines the UDP port range the device allocates for RTP and RTCP media streams.

  4. What is the function of SRTP (Secure Real-Time Transport Protocol) in AudioCodes deployments?

    Answer: It encrypts RTP media streams to protect voice content from eavesdropping

    SRTP adds AES encryption and message authentication to RTP streams, ensuring that voice media is protected from interception and tampering in transit.

  5. In AudioCodes, 'RFC 2833' (now RFC 4733) support is used for:

    Answer: Carrying DTMF tones out-of-band in dedicated RTP packets separate from voice audio

    RFC 2833/4733 defines a mechanism to carry DTMF digits as named telephony events in separate RTP packets, avoiding DTMF tone distortion caused by voice codecs.

  6. What does 'T.38' protocol support on an AudioCodes gateway enable?

    Answer: Real-time fax transmission over IP networks using a dedicated fax-over-IP protocol

    T.38 is the ITU standard for fax-over-IP, allowing fax machines to send and receive faxes reliably over packet networks by using error-corrected redundant UDP/TCP transport.