[Serusers] A bug in www authentication?

[牛坤]

Dear ser users,

Sorry to trouble you all.

I'm developing my own sip client based on the nist jain sip library.
I used SJphone with my SER and it works fine.
When I change to JSphone(sip-communicator),something strange happened.
I read the sourcecode of JSphone. 
It seems that the field nonce and cnonce in the "Authentication" field are both null in JSphone.
However,I can see the values in SJphone are not null.
Both clients can register onto my server.
I wonder if this is a bug in ser.

Thank you for your reply.

Sincerely,
Kun