300-820 · Question #80
Between which two DTMF relay methods does the Expressway support interworking? (Choose two.)
The correct answer is B. RFC 2833 E. H.245 user input indication. Cisco Expressway performs DTMF interworking between calls on different protocols. RFC 2833 (now RFC 4733) is the DTMF relay method used in SIP calls, where tones are sent as RTP telephone-event packets. H.245 User Input Indication (UII) is the DTMF relay method used in H.323…
Question
Between which two DTMF relay methods does the Expressway support interworking? (Choose two.)
Options
- Aunsolicited notify
- BRFC 2833
- CKPML
- Dpassthrough
- EH.245 user input indication
How the community answered
(59 responses)- A2% (1)
- B95% (56)
- D3% (2)
Explanation
Cisco Expressway performs DTMF interworking between calls on different protocols. RFC 2833 (now RFC 4733) is the DTMF relay method used in SIP calls, where tones are sent as RTP telephone-event packets. H.245 User Input Indication (UII) is the DTMF relay method used in H.323 calls. When Expressway bridges a SIP call to an H.323 call, it translates DTMF between these two methods. KPML is a SIP-specific DTMF method not supported for Expressway interworking, 'passthrough' is in-band audio (not a relay protocol), and 'unsolicited notify' is not a standard DTMF relay method.
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