[Kamailio-Users] syntax error

[GEMINORIUM crux]

hi,
i am new to kamailio,

getting syntax error:

$var(test) =  "udp:"+$rd+":"+$rp;
t_relay_to_udp($var(test));

t_relay_to_udp($rd,$rp);

working with string.

is there any reason ? how to resolve it ?
i have to use database so i need to use variable.

any suggestion is appreciated.

thanks
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