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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).
What Is MoIP

What Is MoIP


The term "modem" is abbreviated from modulator and demodulator. Modem service is a data service that is widely applied on the PSTN network. In its earlier application, modem service is mainly used for point-to-point dialing and Internet dialup. Later, the service scope is expanded to cover point of service (POS) machine connection, alarming, and lottery machine connection.

Modem over Internet Protocol (MoIP) is a technology for providing modem services over an IP network or between an IP network and a PSTN network.

The dialup mode of modems can be pulse dialup and tone dialup.
  • In the traditional modem dialup scenario, PSTN users directly dial numbers, and the media stream passes through only the narrowband channel.
  • MoIP differs from the traditional modem dialup service in that MoIP users are next generation network (NGN) access gateway (AG) users, and that modem negotiation and media stream transmission between the AG and the trunk gateway are performed based on IP.

MoIP Services

Modem services are usually transmitted using the V.32/V.34/V.90/V.92 protocol. Different modem protocols support different ranges of rates. In practical service application, the transmission rate is usually the result negotiated by the two modems at both ends.
  • V.32 supports a maximum rate of 14.4 kbit/s.
  • V.34 supports a maximum rate of 33.6 kbit/s. V.34 is the modem protocol most commonly used. It defines a negotiation process that is the same as the high-speed fax process. One application example of V.34 is the POS machine service.
  • V.90/V.92 supports a maximum rate of 56 kbit/s and is usually used for Internet dialup services.
Modem services are classified into high-speed modem services and low-speed modem services. The negotiation process of high-speed modem services is the same as that of high-speed fax services.
  • Based on the service rate, services with rates lower than or equal to 14.4 kbit/s are low-speed modem services, and services with rates higher than 14.4 kbit/s are high-speed modem services.
  • Based on the modem's requirements on the network, modems that require the network device involved to disable the echo cancelation function are high-speed modems, and modems that do not require so are low-speed modems.
Updated: 2019-02-22

Document ID: EDOC1100067358

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