Camel SMPP custom SMS port

Question

I'm currently trying to send a SMS with Camel SMPP but I'm failing on sending it to a specific destination port. Actually nothing port related happens on my SMPP server. Here is my current code in my Processor :

exchange.getOut().setHeader("CamelSmppAlphabet", Alphabet.ALPHA_8_BIT.value());
exchange.getOut().setHeader("CamelSmppDataCoding", 4);

short destport = 5000;
short srcport = 0;

Map<java.lang.Short, java.lang.Short> optParameters = new HashMap<java.lang.Short, java.lang.Short>();
optParameters.put(OptionalParameter.Tag.DESTINATION_PORT.code(), destport);
optParameters.put(OptionalParameter.Tag.SOURCE_PORT.code(), srcport);

exchange.getOut().setHeader("CamelSmppOptionalParameter", optParameters);

Am I doing something wrong ? If so how am I supposed to send my message to a specific destination Port ?

Thanks for your help