[cisco-voip] SRTP over H.323 gw

[Constel]

Hi,

Does anyone have tested SRTP over H.323 gateways?

I'm dealing with a security issue and I'm thinking going through this. 
However I've read this works only on IOS 12.4(6)T and CM 5.x for h.323 
gateways.
Today I'm on 4.1(3) and still not comfortable to upgrade it just because 
this issue.
I would like to hear some opinions about that. Does it work fine? How about 
payload cryptograph: does it increase overhead over WAN?
How about DSP/PVDM usage?

Any information will be appreciated.

thank you
--
Marcelo Zilio