Attribute User-name is mising

[Assa Tal]

 Hi all, 
My Free Radiuss 1.1.1.  doesn't want to  Proxy   an accounting  request
if  he is   missining  the  User-Name attribute
My co partneres are Cellular company and they don't use" User-Name
attribute"
I was trying to use    the radrelay   , but it  has some limitition
Pls help me to resolve this issue
Any help will be appriciate 

My setup is very basic 
My set up goes like this
Proxy.conf
Realm DEFAULT
	type   = radius
             authhost = x.x.x
              accthost.= x.x.x.x
               secret = aaaaa
Realm NULL
	type   = radius
             authhost = x.x.x
              accthost.= x.x.x.x
               secret = aaaaa
I was truing to use hints file but no sueccess
Hints file
DEFAULT   User-Name =  "ccc" , Realm = DEFAULT