Network is sending AVP 'Originator-SCCP-Address' in E-164 encoding format and we are able to parse it properly.
In Seagull dictionary, this AVP is defined as :
<define name="Originator-SCCP-Address" type="OctetString">
<setfield name="avp-code" value="2008"> </setfield>
<setfield name="flags" value="192"> </setfield>
<setfield name="Vendor-ID" value="10415"> </setfield>
</define>
And our code is unable to parse it as input value is being treated like a String, instead of encoded address AVP.