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Voice Feature Guide 01

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Introduction to the R2 Feature

Introduction to the R2 Feature


R2 signaling is a type of channel associated signaling (CAS) and it is also the international standard signaling based on E1 digital networks. Timeslot 16 in the R2 signaling is reserved for transmitting the signaling of the voice channel.

Actually, there is no agreed standard for R2 signaling. ITU-T Recommendation Q.400-Q.490 define the R2 signaling standards but different countries and regions have developed their own standards.


The MA5600T/MA5603T/MA5608T connects an R2 PBX to the next generation network, achieving transformation of the public switched telephone network (PSTN) to the NGN.

Updated: 2019-02-22

Document ID: EDOC1100067358

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