i have call manager 6.0 and phone sets 7942 , 7940 and 7911

i am trying to develop arabic xml services on the phone i have already installed the arabic locale on the call manager and my 7942 set is displaying arabic interface now for everything on the phone except when i am trying to send arabic text

i have these lines at my code :-

""

Response.ContentType = "text/xml";

Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");

Response.Charset = "utf-8";

CultureInfo ci = CultureInfo.CreateSpecificCulture("ar-SA");

Thread.CurrentThread.CurrentCulture = ci;

Thread.CurrentThread.CurrentUICulture = ci;

""

also the http header returned from the phone is

""

{Connection=close&Accept=x-CiscoIPPhone%2f*%2c+text%2f*%2cimage%2fpng%2c*%2f*&Accept-Charset=utf-8%2cISO-8859-1%3bq%3d0.8&Accept-Language=ar_SA&Host=10.64.14.13&User-Agent=Allegro-Software-WebClient%2f4.34&x-CiscoIPPhoneModelName=CP-7942G&x-CiscoIPPhoneSDKVersion=6.0.2&x-CiscoIPPhoneDisplay=298%2c144%2c3%2cG}

""

so the telephone is accepting arabic language but displays it as small question marks inside squares

if any one can help please.