[Serusers] Problems with Grandstream budgetone and handytone

[Maxim Sobolev]

Folks,

It is not really ser-specific problem, but I think that it is a good 
place to ask. We are having problems with getting BT/HT working with our 
system - phones with firmware versions 1.0.4.26 and 1.0.4.17 don't send 
ACK for final 200 OK if the in-band alerting (183 session progress) is 
enabled in the remote UA. Can somebody confirm this problem? And it 
seems that version 1.0.3.81 is OK, but unfortunately there is no way to 
perform firmware downgrade.

Regards,

Maxim