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Cisco Bug: CSCvu66691 - CUBE not resuming call after first REFER failure(error codes 502,480) and CUBE consume the 2nd REFER

Last Modified

Sep 30, 2020

Products (1)

  • Cisco IOS

Known Affected Releases

16.9.5

Description (partial)

Symptom:
CUBE does not send second REFER if he notified by PSTN with error code  502 Bad Gateway and 480 Temporarily_Unavailable
We can see following error message in 'debug ccsip all' after second REFER message:
%SIP-3-BADPAIR: Unexpected event 27 (SIPSPI_EV_CC_CALL_TRANSFER) in state 20 (SIP_STATE_INIT_XFER) substate 0 (SUBSTATE_NONE)

Conditions:
Call-Flow: PSTN >> CUBE >> CVP
                                <<----- 1st REFER
               <<----- 1st REFER
               ----->> NOTIFY (502)
                                ----->> NOTIFY (480)

PSTN >> CUBE >> CVP
                                <<----- 1st REFER
               <<----- 1st REFER
               ----->> NOTIFY (480
                                ----->> NOTIFY (480)
...
...
                                <<----- 2nd REFER
ERROR ... %SIP-3-BADPAIR: Unexpected event 27 (SIPSPI_EV_CC_CALL_TRANSFER) in state 20 (SIP_STATE_INIT_XFER) substate 0 (SUBSTATE_NONE)
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