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Voice Feature Guide 01

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MGCP Standards and Protocols Compliance

MGCP Standards and Protocols Compliance

  • RFC2705
  • RFC3405
  • T.30: It is based on the PSTN network. T.30 particularly defines the flow for transmitting fax signals on the PSTN network. It also defines the modulation mode (V.17/V.21/V.27/V.29/V.34) and transmission format (HDLC) of data, and the physical standard for fax signals. The T.30 fax messages and data can be transmitted transparently between MGs. This is called the T.30 transparent transmission mode. The quality of the fax in this mode may not be high due to packet loss, latency, and disorder on the IP network.
  • T.38: It is a real-time fax mode based on the IP network. In this mode, the MG terminates the T.30 signals sent from the fax machine, and transmits the data to the peer MG in the T.38 mode. The peer MG then receives the T.38 packets and converts the packets into T.30 signals. The merit of the T.38 fax is that the fax packets have a redundancy processing mechanism and do not strictly rely on the quality of the network (the fax service can be processed even when a 20% packet loss occurs on the network). The demerit is that the DSP chip needs to participate in parsing the T.30 signals. Because there are various types of terminals on the network, the compatibility problem may arise.
Updated: 2019-02-22

Document ID: EDOC1100067358

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