[Serusers] additional contact info from grandstream budgetone ?

[maka]

Hi all,

i just got a gradnstream budgetone for testing, and I see some strange
behaviour on its part - it 's adding an additional ;user=phone string
to the contact field it sends to the registrar, and it thus produces
some bad header errors when communicating with the phone.

the phone also gets registered twice for the same number -- once with
the extra information from above, and once without it.

has anyone dealt with something like this?