perlquestion rammoorthi Hi, This is ram. i am getting the error while sending a sms using smpp. the code is: <code> #!perl use strict; use warnings; use Net::SMPP; my $host = '10.100.7.177'; my $port = 5001; my $system_id = 'r123'; my $password = 'r_123'; my ($smpp, $resp_pdu) = Net::SMPP->new_transmitter( $host, system_id => $system_id, password => $password, system_type => 'r123', port => $port ) or die "Cant connect to SMSC: $!"; print "PDU_resp ERROR: ".$resp_pdu->explain_status() if $resp_pdu->status; $smpp->enquire_link() or die "Unable to connect to SMSC"; $resp_pdu = $smpp->submit_sm( destination_addr => '9610985672', short_message => 'Hello World. via SMPP' ) or die; print "PDU_resp ERROR: " . $resp_pdu->explain_status() if $resp_pdu->status; my $msg_id = $resp_pdu->{message_id}; print "\nEOF\n"; ##sleep 30; #$resp_pdu = $smpp->query_sm(message_id => $msg_id) or die; #die "PDU_resp ERROR: ".$resp_pdu->explain_status() if $resp_pdu->status; #print "\nMessage state is $resp_pdu->{message_state}\n"; </code> i am getting the error as <code> D:\Perl>perl smpp1.pl PDU_resp ERROR: Invalid source address (ESME_RINVSRCADR=0x0000000A) EOF </code> The sms heading should be A$-SMS Please help me to resolve this issue. Thanks Ram