Balancing SMPP traffic based on recipient address

Is that normal that i'm never going into the rewrite block? 8* { rewrite seq if { [info exists s_seq_map($seq)] } { set old_seq [lindex $s_seq_map($seq) 0] TCP::payload replace 12 4 [binary format I $s_seq_idx] set addr [lindex $s_seq_map($seq) 1] set port [lindex $s_seq_map($seq) 2] use pool or node command pool [LB::server pool] member $addr $port unset s_seq_map($seq) } }

Neither: 0* { rewrite seq TCP::payload replace 12 4 [binary format I $s_seq_idx] set s_seq_map($s_seq_idx) "$seq [IP::remote_addr] [TCP::remote_port]" incr s_seq_idx }