Shame on me -__-
It was mistake in my config, i forgot to set `$var(nu)`
``` # get user name $var(nu) = $rU; ```
so fixed kamailio.cfg:
``` ... request_route { if($rU=~"^(z#)[0-9][0-9]{1,20}$"){ # get user name $var(nu) = $rU;
# get normal DestNum without prefix $var(nuu) = $(var(nu){s.strip,2});
#set FROM Caller ID /TEST/ # @TODO: Set from callerID HERE $fU = "74951277197";
# new sip uri $ru = "sip:" + $var(nuu) + "@sip.zadarma.com"; route(RELAY); } ... ```