D-Link DVG-3016S User Manual download pdf (Page 36)

 Enable Out-of-Band DTMF: To send DTMF keys (0~9, *, #,) follow the RFC2833 rules or

via SIP Info.

 Enable Hook Flash Event: The gateway will deliver the flash signal to remote party via

RFC2833 or SIP Info.

 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 fails 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 Settings)

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D-Link DVG-3016S User Manual Page 36