[OpenSIPS-Users] How to get RADIUS VSA in script?

[Dmitry Lyubimkov]

Hello. 
We use OpenSER V.1.3.2 
During authentification RADIUS server sends (in answers) some additional
attributes.(from a dictionary file)
VENDOR          Cisco           9
ATTRIBUTE       h323-return-code                103     string
Cisco
For example h323-return-code =-2 

How can I get value of this attribute in openser script?
For example RPID I receive as follows: 
avp_aliases = "username=s:1; calledid=s:30; callingid=s:31; rpid=s:rpid" 
and I use $avp(rpid) in a code of the program 

but I cannot receive so h323-return-code because it is Vendor specific. 
Can I learn it otherwise from a script? 
Or the single method = setup intermediate RADIUS proxy to translate this
attribute to any standard attribute number? 

Thanks. Dmitry.