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Cisco 350-801: What DTMF Signaling Method Allows Cisco 8800 Series IP Phone Users to Access SIP-Connected IVR Through CUBE?

By: Author Alex Lim

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Learn the correct DTMF signaling configuration on Cisco Unified Border Element (CUBE) to enable Cisco 8800 series IP phone users to access a SIP-connected DTMF-based IVR solution. Discover why the dtmf-relay rtp-nte command is the best choice for in-band signaling of user keypresses.

Table of Contents

Question

Cisco UCM users with Cisco 8800 series IP telephones require access to a DTMF-based IVR solution. The IVR is connected via SIP through a Cisco Unified Border Element. Which configuration uses in-band signaling for the users’ keypresses?

A. dtmf-relay sip-kpml
B. dtmf-relay rtp-nte
C. dtmf-relay sip-notify
D. dtmf-relay sip-inband

Answer

B. dtmf-relay rtp-nte

Explanation

When Cisco 8800 series IP telephone users need to access a DTMF-based IVR solution connected via SIP through a Cisco Unified Border Element (CUBE), the appropriate configuration for in-band signaling of user keypresses is the “dtmf-relay rtp-nte” command.

Here’s why:

  1. The “dtmf-relay rtp-nte” command enables DTMF relay using Real-Time Transport Protocol (RTP) with the Named Telephone Events (NTE) payload type. This method transmits DTMF tones as in-band audio within the RTP media stream.
  2. In-band signaling means that the DTMF tones are sent as part of the audio stream itself, ensuring compatibility with the DTMF-based IVR solution.
  3. Other options like “dtmf-relay sip-kpml”, “dtmf-relay sip-notify”, and “dtmf-relay sip-inband” use out-of-band signaling methods (SIP KPML, SIP NOTIFY, or SIP INFO), which may not be compatible with the IVR’s requirements for in-band DTMF.

By configuring “dtmf-relay rtp-nte” on CUBE, the system ensures that the Cisco 8800 series IP phone users’ keypresses are accurately transmitted to the IVR solution using in-band signaling, allowing seamless interaction with the DTMF-based system.

Cisco 350-801 certification exam assessment practice question and answer (Q&A) dump including multiple choice questions (MCQ) and objective type questions, with detail explanation and reference available free, helpful to pass the Cisco 350-801 exam and earn Cisco 350-801 certification.