Nonstandard MTI 1820

I am working through our field trial of jPos and came across a minor 
problem which I am trying to determine the best way to resolve.

I have an 1820 coming into our jPos switch which is forwarded on to an 
existing 8583 switch. This swith receives the 1820 and responds with an 
MTI of 1824 (nonstandard I believe) jPos seems to be looking for an MTI 
of 1830.

For example, if I use my echoServer which receives any msg and only 
sets the outgoing MTI (1820->1830) everything works fine.  However, if 
I send the exact same message to my existing switch the TXN times out 
even though the switch returned the message (as an 1824).  The <key> 
that I am using is the STAN (field 11) and that is returned intact but 
jPos does not recognize this and the TXN eventually falls into my 
unhandled queue.

I did not think that the MUX looked at the MTI but I must be mistaken.

I am thinking of running a channel monitor to look for 1830's and 
change them into 1824's but before I set out on that path I thought I 
would see if you have a more elegant way of correcting this issue or if 
I am just missing something that should be obvious.

Thanks,

-John

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