Cannot register MGCP gateway to CCM 4.1

Hello,
   I am running an application which simulates a MGCP gateway vs. a real CCM 4.1. I am not able to register the endpoints as you can see from the snapshot attached. I guess the problems lies in the 200 response to the following AUEP:
AUEP 89 AALN/S0/SU0/[email protected] MGCP 0.1
F: X+SRTP/A
200 89 OK
X: 2
L: p:20, a:PCMU, b:64, e:ON, s:ON
    I have also attached the trace file and CCM logs.
   I have 2 questions on this matter:
what is the correct format of the 200 message which needs to be sent to AUEP with SRTP?
how can I configure CCM not to sent this AUEP with SRTP(I have a similar one in my setup which is not sending this AUEP)?
Thanks in advanced for you support,
Ionut

Restrictions for Cisco Multiservice IP-to-IP Gateway Configuration:
Restrictions for SIP-to-SIP Call Signaling:
Transcoding is not supported.
SIP-to-H.323 Call-Signaling Features:
Codec transcoding (G.711-G.729) - supported
other:Transcoding is not supported on the Cisco 7200 and the Cisco 7301
copied from:cisco Multiservice IP-to-IP Gateway
http://www.cisco.com/en/US/products/sw/voicesw/ps5640/products_configuration_guide_book09186a0080409b6d.html
I have not found a solution, but i'd be interested in what you find though.

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