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QuestionQ42

Voice Gateways and Session Border Controllers

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Refer to the exhibit. A customer provides this debug output, captured on a Cisco IOS router. Assuming an MGCP gateway is configured with an ISDN BRI interface, which BRI changes resolve the problem?

  • A interface BRI0/1/1 no ip address isdn switch-type basic-net3 isdn incoming-voice voice isdn send-alerting isdn static-tei 0
  • B interface BRI0/1/0 no ip address isdn switch-type basic-net3 isdn point-to-multipoint-setup isdn incoming-voice voice isdn send-alerting isdn static-tei 0
  • C interface BRI0/1/1 no ip address isdn switch-type basic-net3 isdn point-to-point-setup isdn incoming-voice voice isdn send-alerting isdn static-tei 0
  • D interface BRI0/1/1 no ip address isdn switch-type basic-net3 isdn point-to-multipoint-setup isdn incoming-voice voice isdn send-alerting isdn static-tei 0
Explanation

For an MGCP-controlled ETSI BRI connection, the interface uses the basic-net3 switch type and a static TEI. isdn point-to-point-setup causes the ISDN port to send SETUP messages using that static TEI; with isdn static-tei 0, it prevents the dynamic TEI identity-request behavior shown in the Q.921 exchange. The configuration must be applied to BRI0/1/1.

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