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QuestionQ273

Voice Gateways and Session Border Controllers

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Refer to the exhibit. Calls to Cisco Unity Connection fail across Cisco Unified Border Element when callers attempt to choose a menu prompt. Why does this occur, and how is it corrected?

  • A Cisco Unified Border Element is sending the incorrect media IP address. The IP address of the loopback interface must be advertised in the SDP.
  • B Cisco Unity Connection is configured on G.729 only. Cisco Unity Connection must be reconfigured to support iLBC.
  • C Cisco Unified Border Element is not sending any support for DTMF. DTMF configuration must be added to the appropriate dial peer.
  • D The Cisco Unity Connection Call Handler is configured for a ג€Release to Switchג€ transfer type. Transfers must be disabled for the Cisco Unity Connection Call Handler.
Explanation

The SDP lacks an RTP Named Telephone Event (telephone-event) media attribute, so DTMF digits needed to navigate the Unity Connection menu are not negotiated. Configure an appropriate DTMF relay method on the applicable CUBE SIP dial peer, typically dtmf-relay rtp-nte when RFC 2833/RTP NTE is required. Cisco documents that DTMF relay is configured on VoIP dial peers and that RTP NTE carries DTMF using RTP named telephone events.

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