For SIP INFO, the system requires a transcoding device with the ProSBC to detect DTMF tones. In another way, it can be said, as the DTMF is needed to be detected by ProSBC, a transcoding unit is needed.
For SIP INFO, the system requires a transcoding device with the ProSBC to detect DTMF tones. In another way, it can be said, as the DTMF is needed to be detected by ProSBC, a transcoding unit is needed.