Cisco Cisco IOS Software Release 12.4(4)T
416
Caveats for Cisco IOS Release 12.4T
OL-8003-09 Rev. Z0
Resolved Caveats—Cisco IOS Release 12.4(20)T6
Workaround: No side effect, it is a CLI which should be hidden.
Further Problem Description: Svc-translation-table option is not supported. It should be hidden.
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CSCsu87180
Symptoms: The MPLS support/CLI is missing in Cisco 3270 released images in Cisco IOS
Release 12.4(15)T.
Release 12.4(15)T.
Conditions: The support was deprecated in Cisco IOS interim Release 12.4(18.04)T1 and
Release 12.4(15)T3.
Release 12.4(15)T3.
Workaround: There is no workaround.
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CSCsu88745
Symptoms: SCCP phones fail to register with Cisco Unified CallManager Express (CME).
Conditions: This symptom occurs when auto register is enabled without ephone/ephone-dn
configuration.
configuration.
Workaround: Configure ephone and ephone-dn for all SCCP phones.
Resolved Caveats—Cisco IOS Release 12.4(20)T6
Cisco IOS Release 12.4(20)T6 is a rebuild release for Cisco IOS Release 12.4(20)T. The caveats in this
section are resolved in Cisco IOS Release 12.4(20)T6 but may be open in previous Cisco IOS releases.
section are resolved in Cisco IOS Release 12.4(20)T6 but may be open in previous Cisco IOS releases.
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CSCsu47486
Symptoms: Cisco IOS Software configured with MGCP may reload.
Conditions: This symptom is observed if an authenticated user repeatedly configures mgcp
block-newcall, no mgcp block-newcall while active calls are being made.
block-newcall, no mgcp block-newcall while active calls are being made.
Workaround: Wait for all active calls to terminate before configuring no mgcp block-newcall.
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CSCsw40203
Symptoms: A Cisco ASR 1000 may crash with certain malformed IKE packets.
Conditions: This symptom is observed on a Cisco ASR 1000 that is configured for IPSec VPN with
digital certificates.
digital certificates.
Workaround: There is no workaround.
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CSCsy29533
Symptoms: A T.38 fax relay call may fail.
Conditions: The symptom is observed with an MGCP-controlled T.38 fax relay call when the
gateway is configured for CA control T.38. The output of the debug voip vtsp all command shows
fax relay as “DISABLED.”
gateway is configured for CA control T.38. The output of the debug voip vtsp all command shows
fax relay as “DISABLED.”
Workaround: Use Cisco IOS Release 12.4(15)T7 or Release 12.4(22)T.
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CSCsz43987
Multiple vulnerabilities exist in the Session Initiation Protocol (SIP) implementation in Cisco IOS
Software that could allow an unauthenticated, remote attacker to cause a reload of an affected device
when SIP operation is enabled.
Software that could allow an unauthenticated, remote attacker to cause a reload of an affected device
when SIP operation is enabled.
Cisco has released free software updates that address these vulnerabilities. There are no
workarounds for devices that must run SIP; however, mitigations are available to limit exposure to
the vulnerabilities.
workarounds for devices that must run SIP; however, mitigations are available to limit exposure to
the vulnerabilities.