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38 SmartVoice Gateway(s) User Guide
YML832 Rev2
•Payload Type: payload type of RFC2833.
•Uses Second CPT for VoIP Call: This function is usually applied when the user selects VoIP as
the primary path for outgoing calls and PSTN as the backup. By enabling this function, the gateway
will generate a different set of tones to inform the user that VoIP is in service. Should VoIP fail and
fallback to PSTN, the user will hear PSTN tones instead of the second set CPT. (for CPT related
settings, please refer to Trunk Management -> CPT/Cadence Settings).