[Serusers] error 513 when sendin a message

[Ángel Gómez]

Hi, I has send a MESSAGE to my SER server and it allways send me the
response "513 message to big".

I send it with sipsak -s sip:ninguna at 10.22.1.249 -vvv -l 5060 -M, when
I send a REGISTER or INVITE it works whell.

I have alias for various domains, an it can´t be te error, have somo
one had this error ever? How can I get RIP of it? please help.