[Serusers] call transfer

[Iqbal]

Hi

I have an interesting problem, with one of my setups, call transfers are 
fine ip to ip, but if the call comes in via PSTn to a ip phone, which 
then wants to transfer to another ip phone, I get 404 Not found.

On transfer there is a INVITE sent to the originator, and then followed 
by a REFER, on the first INVITE which is sent to the PSTN is says user 
not found, has anyone got a setup like this.

Iqbal