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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In reply to Re^3: issue in SMS Connectivity by Mr. Muskrat
in thread issue in SMS Connectivity by rammoorthi

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