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IOS bug in SIP call setup: Non-incrementing CSeq header field value

We encountered an issue with our Cisco 2621 GW in call set-up with some SIP phones and SIP servers. The Cisco sends problematic re-invite messages which doesn't get any positive response to it because the Cisco does not increase the CSeq header value in the re-INVITE messages !

does anyone know how to resolve the issue of in Cisco? Maybe we should use a different version of IOS.

Here is the “sh ver” output of our GW:

Cisco IOS Software, C2600 Software (C2600-SPSERVICESK9-M), Version 12.3(14)T7, RELEASE SOFTWARE (fc2)

ROM: System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)

System image file is "flash:c2600-spservicesk9-mz.123-14.T7.bin"

Cisco 2621XM (MPC860P) processor (revision 0x401) with 125770K/5302K bytes of memory.

Processor board ID FCZ093670YT (3282082554)

M860 processor: part number 5, mask 2

2 FastEthernet interfaces

31 Serial interfaces

1 Channelized E1/PRI port

32K bytes of NVRAM.

49152K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

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Re: IOS bug in SIP call setup: Non-incrementing CSeq header fiel


you should try if it happens with latest 12.4 as well.

If it does, you need to seek help from the tac in case a bug nedd to be located or filed as new.

Hope this helps, please rate post if it does!