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Cisco Bug: CSCvi04907 - T38 Packets are dropped by CUBE on ISR G2 in Multi VRF Scenario

Last Modified

Oct 30, 2019

Products (155)

  • Cisco IOS
  • Cisco Catalyst 3650-48TQ-L Switch
  • Cisco Catalyst 3650-48FQM-L Switch
  • Cisco Catalyst 3650-8X24UQ-E Switch
  • Cisco Catalyst 3650-24TD-S Switch
  • Cisco Catalyst 9300-48UXM-A Switch
  • Cisco Catalyst 9300-48U-A Switch
  • Cisco Catalyst 3650-12X48UQ-L Switch
  • Cisco Catalyst 3650-12X48UR-L Switch
  • Cisco Catalyst 3850-48XS-E Switch
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Known Affected Releases

15.7(3)M Everest-16.6.1

Description (partial)

T38 fax failing on ISRg2 platform which is configured as CUBE with multi VRF. 
CUBE receive  T38 packets from one Leg but never forward these packets to other call leg. 
"show call active voice brief " and "debug voip rtp packets" show packets are send out .But when we collect packet captures from CUBE interface ,we could not see t38 packets.

CUBE is configured to use different VRF on incoming and outgoing  Call leg
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