Refer to the exhibit. A customer reports that MTP resources are being used in the recently deployed Cisco UCM and wants no MTP resources to be used. Cisco UCM SIP trunk configuration does not have…

Question

Exhibit

Options

• AChange Cisco Unified Border Element configuration to "dtmf-relay rtp-nte".
• BChange Cisco Unified Border Element configuration to "dtmf-relay sip-notify sip-kpml".
• CChange Cisco UCM SIP trunk DTMF Signaling Method to "sip-notify".
• DChange Cisco UCM SIP trunk DTMF Signaling Method to "sip-kpml".

• A
  76% (19)
• B
  12% (3)
• C
  4% (1)
• D
  8% (2)

Explanation

In this scenario, the Media Termination Point (MTP) is being used despite the "MTP Required" option not being checked on the SIP trunk. One common reason for this is a mismatch in the DTMF relay method between Cisco Unified Border Element (CUBE) and Cisco Unified Communications Manager (CUCM). The current CUBE configuration uses dtmf-relay sip-notify, while CUCM is set to use RFC 2833, which is equivalent to rtp-nte on CUBE. These two methods are incompatible, leading to MTP invocation to bridge the mismatch. To resolve this, you should configure CUBE to use dtmf-relay rtp-nte, ensuring that both sides use RFC 2833 for DTMF signaling, preventing unnecessary MTP usage.

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