Rejecting message due to parse error

Hi All,

In the last hour or so, I was investigating why a call
is not coming through.

It appear that there was a parse error in the message:

java.text.ParseException: From: "michael"
<sip:MIK_S>;tag=8a188006855544c8becca97c8e7d5fb8

Expecting  >>>><<< got >>>_<<<
        at
gov.nist.core.LexerCore.match(LexerCore.java:248)
        at
gov.nist.javax.sip.parser.AddressParser.nameAddr(AddressParser.java:58)
        at
gov.nist.javax.sip.parser.AddressParser.address(AddressParser.java:86)
        at
gov.nist.javax.sip.parser.AddressParametersParser.parse(AddressParametersParser.java:29)
        at
gov.nist.javax.sip.parser.FromParser.parse(FromParser.java:34)
        at
gov.nist.javax.sip.parser.StringMsgParser.parseMessage(StringMsgParser.java:551)
        at
gov.nist.javax.sip.parser.StringMsgParser.parseSIPMessage(StringMsgParser.java:323)
        at
gov.nist.javax.sip.stack.UDPMessageChannel.run(UDPMessageChannel.java:236)
        at java.lang.Thread.run(Unknown Source)

Rejecting message !  INVITE
sip:[email protected]:5060 SIP/2.0




The “From:” header is initialized by the computer’s
name which appears to include "_".

Now: 
a. Can we tolerate this? The messaging can be handled
with an _ in the text.
b. Information about such rejection should be send to
the application level to save time of the unsuspecting
programmer ;-)

Thanks,

Michael