[Serusers] pa cannot work as a B2BUA?

[mma]

hi, 

i read in pa module that  it cannot subsribe to presence of users using SIP,
so how can i do to manage the presence of my contact list

i added pa module to SER  and a had this errors in response to a SUBSCRIBE request
parse_hfs(): Error while parsing headers

handle_subscription(): Error while parsing message header



please i need help



regards
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