Thanks, your recomendations are implemented in new commits. Realy, I think, 
that free() is called in function, that destroys avp, but when I inspect 
usr_avp, I understood that I done a mistake. Similary, I added correct 
processing of malloc() errors, malloc() and free() was replaced to pkg_malloc() 
and pkg_free() respectively. I look at SIP-AVP processing and found one mistake 
(for '#' in string value case, I`m not considered this option), and this 
corrected too in new commits. In my oppinion, not using memory allocation in 
this section will be very traumatic for kamailio, because we don`t know, in 
which place in memory we place our string values.

Discussion question: some vendors (as Cisco) put name in value too. Cisco 
placed '=' between name part of value and value part of value. Some other 
vendors may put some other symbols. In my code I checking '=',':' and '#' by 
analogy with SIP-AVP pair syntax. Whether it is necessary or not?

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