Cisco Cisco IOS Software Release 12.4(4)T

CSCsj32707

Symptoms: A "SIP UPDATE" message from a Cisco CallManager or SIP Proxy Server with a 
"Cseq" value of 0 may be rejected or considered invalid by a Cisco gateway.

Conditions: This symptom is observed on a Cisco gateway that runs Cisco IOS Release 12.4(9)T4 
or a later release and that is connected to a SIP endpoint.

Workaround: There is no workaround. Note that the symptom does not occur in Release 12.4(9)T3. 

CSCsj34083

Symptoms: Packets in traffic queues that are below their configured threshold may be dropped.

Conditions: This symptom is observed on a Cisco 877 and Cisco 1801 that run Cisco IOS 
Release 12.4(9)T3 when one of the queues trespasses its threshold. Note the following scenarios:

When congestion is present, traffic that exceeds its threshold on a CBWFQ service class causes 
drops on the LLQ classes although the traffic that is associated with the LLQ classes is below 
the associated threshold.

When best-effort bandwidth exceeds its threshold, LLQ traffic is discarded although it is below 
its own threshold.

When there is no congestion, the router operates as expected.

Workaround: There is no workaround.

Further Problem Description: Note that the symptom does not occur on a Cisco 878 and Cisco 1803. 

CSCsj43861

Symptom: Ezvpn hardware client will not attempt to connect to the same peer or the next peer after 
QUICK MODE failure during IKE

Conditions: Ezvpn hardware client will remain in SS_OPEN state after the failure of QUICK MODE

Workaround: Clear the ezvpn session 

CSCsj47356

Symptoms: Phone A believes that its offer (in first INVITE) is not answered yet, but that is wrong 
because UPDATE is for the second leg where the SDP answer is already sent in a 183 Session 
Progress.

Conditions: Call forwarding scenario. Call comes in from PSTN to a SIP, and forwarded to a another 
SIP Phone.

Workaround: There is no workaround.

CSCsi40766

Symptoms: H.323 calls on a Cisco IOS VoIP gateway may fail after the gateway has processed about 
54,500 calls.

Conditions: This symptom is observed when H.323 uses TCP to transport signaling messages. When 
the Cisco IOS gateway must generate a unique port for the local TCP session, this port is selected 
from a range of open ports. When the number of times that an unique TCP session is created for the 
same IP address on the gateway exceeds 54,500, further attempts to create a local TCP port fail and 
calls are not completed.