[cisco-voip] ASA Phone-Proxy, CUCM 7.1(5b)SU4, and 7921/7925

[c3voip]

I have upgraded from CUCM 7.1(2a) to CUCM 7.1(5b)SU4 without any issues, but
now I am having issues loading firmware to my 7921 and 7925 wifi phones
through my ASA5520 with the Phone Proxy feature.  

 

Here comes the curveball, if I turn on phone-proxy tftp debugs on the ASA
everything works normally, but nothing has changed on the ASA so why should
this allow tftp to work? 

 

I have taken packet captures from both sides of the ASA, without the debug
turned on, and the wifi phone just looks like it stops ACK'ing the tftp
packets.

 

 

Does anyone else have a setup similar to mine or has anyone experienced
anything like this?

 

Thanks,

-C

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