BugZero | Cisco BugID CSCwb56871 - Call Drop with cause code 47, VOICE_IEC-3-GW:SIP:I...

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BugZero | Cisco BugID CSCwb56871 - Call Drop with cause code 47, VOICE_IEC-3-GW:SIP:I...

ODD
Cisco
CSCwb56871

Cisco - Defect ID: CSCwb56871

Call Drop with cause code 47, VOICE_IEC-3-GW:SIP:Internal Error (Software Error): IEC=1.1.180.7.13.0

ODD
Cisco
CSCwb56871

Cisco - Defect ID: CSCwb56871

Call Drop with cause code 47, VOICE_IEC-3-GW:SIP:Internal Error (Software Error): IEC=1.1.180.7.13.0

Last updated on January 11th, 2026

BugZero Risk Score
7.8 High

Overall: 7.8

Severity: 8.2

Lifecycle: 9.1

Popularity: 5.1

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Bug Details

Views: 5

Description

Symptom

Calls dropping

Conditions

the following configured > "pass-thru content sdp"

Workaround

remove "pass-thru content sdp"

Further Problem Description

The issue is only seen when passthru content SDP is configured. And in the escalated call. Basically when the audio call is established and escalated to a video call and then the call is put on hold and resumed. In this case, we create a DP session and we increment the RTP stats incremented. However, when the call is disconnected we do not delete the DP session and that’s because the RTP stats are stuck within a response from DP. This leaves a dangling fpi session - Which is causing the issue .

Change history

2026-01-11 Added: 17.3.4a, Amsterdam-17.3.4a

Relevant Products

Click on a version to see all relevant bugs

Affected versions:17.3.4a, Amsterdam-17.3.4a

Fixed versions: 17.10.1, 17.10.1a, 17.10.1b, 17.11.1, 17.11.1a, 17.12.02a, 17.12.1, 17.12.1a, 17.12.1w, 17.12.1x, 17.12.1y, 17.12.1z, 17.12.1z1, 17.12.1z2, 17.12.1z3, 17.12.1z4, 17.12.1z5, 17.12.1z6, 17.12.2, 17.12.2a, 17.12.3, 17.12.3a, 17.12.4, 17.12.4a, 17.12.4b, 17.12.5, 17.12.5a, 17.12.5b, 17.12.5c, 17.12.5d, 17.12.6, 17.12.6a, 17.13.1, 17.13.1a, 17.14.1, 17.14.1a, 17.15.1, 17.15.1a, 17.15.1b, 17.15.1w, 17.15.1x, 17.15.1y, 17.15.1z, 17.15.2, 17.15.2a, 17.15.2b, 17.15.2c, 17.15.3, 17.15.3a, 17.15.3b, 17.15.4, 17.15.4a, 17.15.4b, 17.15.4c, 17.15.4d, 17.15.4s1, 17.16.1, 17.16.1a, 17.17.1, 17.18.1, 17.18.1a, 17.18.1w, 17.18.2, 17.3.7, 17.3.8, 17.3.8a, 17.6.5, 17.6.5a, 17.6.6, 17.6.6a, 17.6.7, 17.6.8, 17.6.8a, 17.9.2, 17.9.2a, 17.9.3, 17.9.3a, 17.9.4, 17.9.4a, 17.9.5, 17.9.5a, 17.9.5b, 17.9.5c, 17.9.5d, 17.9.5e, 17.9.5f, 17.9.6, 17.9.6a, 17.9.6b, 17.9.7, 17.9.7a, 17.9.7b, 17.9.8

Relevant Products

Click on a version to see all relevant bugs

Affected versions:17.3.4a, Amsterdam-17.3.4a

Fixed versions: 17.10.1, 17.10.1a, 17.10.1b, 17.11.1, 17.11.1a, 17.12.02a, 17.12.1, 17.12.1a, 17.12.1w, 17.12.1x, 17.12.1y, 17.12.1z, 17.12.1z1, 17.12.1z2, 17.12.1z3, 17.12.1z4, 17.12.1z5, 17.12.1z6, 17.12.2, 17.12.2a, 17.12.3, 17.12.3a, 17.12.4, 17.12.4a, 17.12.4b, 17.12.5, 17.12.5a, 17.12.5b, 17.12.5c, 17.12.5d, 17.12.6, 17.12.6a, 17.13.1, 17.13.1a, 17.14.1, 17.14.1a, 17.15.1, 17.15.1a, 17.15.1b, 17.15.1w, 17.15.1x, 17.15.1y, 17.15.1z, 17.15.2, 17.15.2a, 17.15.2b, 17.15.2c, 17.15.3, 17.15.3a, 17.15.3b, 17.15.4, 17.15.4a, 17.15.4b, 17.15.4c, 17.15.4d, 17.15.4s1, 17.16.1, 17.16.1a, 17.17.1, 17.18.1, 17.18.1a, 17.18.1w, 17.18.2, 17.3.7, 17.3.8, 17.3.8a, 17.6.5, 17.6.5a, 17.6.6, 17.6.6a, 17.6.7, 17.6.8, 17.6.8a, 17.9.2, 17.9.2a, 17.9.3, 17.9.3a, 17.9.4, 17.9.4a, 17.9.5, 17.9.5a, 17.9.5b, 17.9.5c, 17.9.5d, 17.9.5e, 17.9.5f, 17.9.6, 17.9.6a, 17.9.6b, 17.9.7, 17.9.7a, 17.9.7b, 17.9.8

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