[Serusers] scope & database operations for avp_write

Valued Colleagues,

Can anyone tell me what is the scope of avp_write?!

Is it global / per-transaction / per-message?!

I would like to have something similar to it with global scope so that I can

set the string "callfwd" once by executing:

avp_write("sip:211@10.1.10.22:5060", "s:callfwd");

and then keep using it for each SIP message processing using:

avp_pushto("$ruri", "s:callfwd");

Also, do the avp_write and avp_pushto involve Database access operations?!

i.e. Does avp_write store the string in database and avp_pushto looks it up

form the database or is the information stored in memory?!

I want to avoid database access to ensure improved performance.

Thanks

ramin