The error isn't about the destination address so why change that? It sounds like the server is expecting a non-null source address so pass one with source_addr in the call to submit_sm.
$resp_pdu = $smpp->submit_sm(
source_addr => '', # add your source address here
destination_addr => '9610985672',
short_message => 'Hello World. via SMPP'
) or die;
print "PDU_resp ERROR: " . $resp_pdu->explain_status()
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