Consultative Call Transfer Problem with IOS 12.4(20)T2 on the UC520

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Jul 2nd, 2009
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I have discovered the consultative call transfer problem. The consultative call transfer problem occurs with 12.4(20)T2, which is in the 7.0.2 and 7.0.3 releases, but does not occur with the 12.4(22)YB1, which is in the 7.1.1 early adopter release, or the 12.4(11)XW releases (which are included in the 4.2.x releases). I have seen similar call transfer problems reported by other UC520 users in the Cisco Community Central forums.


Will there be a updated software pack for the UC520 that fixes this problem? This problem does not appear in the 7.1.1 early adopter software pack, which includes the IOS 12.4(22)YB1 release.


One workaround for the consultative call-transfer problem is to do the following:

uc500#conf t

uc500(config)#telephony-service

uc500(config-telephony)#transfer-system full-blind


The above commands disables consultative transfer and only performs blind transfers.

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John Platts Thu, 07/02/2009 - 17:45
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I have found out what was really going on. There are two different versions of the 12.4(20)T2 release that I know of.


The bad release that has the problem has the following file size and MD5 checksum:

File name: uc500-advipservicesk9-mz.124-20.T2

File size: 28,064,456 bytes

MD5 checksum: 2252a133d94a9e549b0e093213473ede


The good release, included in the 7.0.3 release, has the following file size and MD5 checksum:

File name: uc500-advipservicesk9-mz.124-20.T2

File size: 28,064,464 bytes

MD5 checksum: c9f924dd6e80cd1115468be6408d5051


The good 12.4(20)T2 release does not appear to exhibit the same problems as the bad 12.4(20)T2 release.


You can check the file size of the release by executing the show flash command.

You can check the MD5 checksum by executing the verify flash:uc500-advipservicesk9-mz.124-20.T2 command.

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