Hi All,
 
Does SIP server at iptel.org support UDP register?
When my UA rigister to iptel.org whith UDP, the 401 response always replied by SER at port
100xx(example 10028). But in my contact of rigister port assigned to 5060.
So, my UA can't recive the 401 response, register failure.
 
But use TCP everyting is OK?
 
Can anyone give me help? 
 
Best regards,
Steven Wu