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Voice Feature Guide 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Principle of MoIP

Principle of MoIP

Just like VoIP, MoIP supports the AG-based PSTN-IP-PSTN network structure, and also supports the PSTN-IP network structure.

MoIP Transmission Modes

MoIP has two transmission modes:
  • Transparent transmission mode, which is also called the voice-band data (VBD) transparent transmission mode. In this mode, the AG uses the G.711 mode to encode and decode the modem signals, and processes the signals like processing common Real-time Transfer Protocol (RTP) data. In other words, the AG does not process the modem modulation signals, which are transparently transmitted on the IP network through VoIP channels. Figure 1-119 shows the MoIP transparent transmission mode.
    Figure 1-119 MoIP transparent transmission mode
    • High-speed modem: with voice activity detector (VAD) and echo canceller (EC) disabled.
    • Low-speed modem: with VAD disabled and EC enabled.
  • Redundancy mode, which is also called the relay mode.
Currently, Huawei AGs support only the transparent transmission mode for MoIP.

Enhanced MoIP

The MoIP service carried in transparent transmission mode has high requirements on the bearer network. Jitter, delay, and packet loss on the network will affect modem services significantly. In case of poor network quality, the MoIP service can be enhanced using the RFC 2198 and 10-ms packetization technologies. Using these technologies, the connection success ratio can be improved for modems, and the modem disconnection ratio will be reduced as well. For more details, see Fax/Modem Quality Enhancement.

Updated: 2019-02-22

Document ID: EDOC1100067358

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