A terrestrial trunked radio gateway (102) is provided herein. The terrestrial trunked radio gateway (102) includes a conference server (114) configured to perform switching of audio input from a voice over internet protocol (VoIP) phone (104). The terrestrial trunked radio gateway (102) further includes a pulse code modulation (PCM) driver (116) configured to insert an algebraic codebook excited linear prediction (ACELP) voice data for transmission to tetra network (106). The terrestrial trunked radio gateway (102) further includes a user agent server (UAS)/a user agent client (UAC) (118) configured to connect to the VoIP phone (104) via a VoIP network (122). The terrestrial trunked radio gateway (102) further includes an access net gateway (AGW) (120) configured to function as an access net common application programming interface (ACAPI) client communicating with an access net common application programming interface (ACAPI) server 109. The terrestrial trunked radio gateway (102) is configured to work as a signaling gateway and allow communication between the VoIP phone (104) and a mobile radio terminal (112). The VoIP phone (104) is configured to use a built-in algebraic codebook excited linear prediction (ACELP) codec to convert voice captured into the ACELP formulated data before transferring to tetra gateway (102).
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