[SR-Users] Fetching proxy-autheticate header from 407 Response

[vivek at advaitamtech.com]

Hi All,
 
Am not using the authentication in the kamailio.
 
So I will be receiving the "407 Proxy Authentication Required" response from the third party server for the first INVITE.
 
I want to fetch the Proxy-Authenticate header present in the 407 response.
 
I browsed and tried using the pseudo-variables "$adu/$aa/$ar". It dint work. 
 
Please let me know if there is a way to fetch this header.
 
Thanks,
Vivek.
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