Attented transfert problem

I have a installation asterisk 1.2.28 and I try to use attended transfert with gsm but if I have a voicemail and I want to give the initial caller with * touch on IP10S telephone (avoid attended transfert).

the initial caller is in a queue “standard”.

The * touch activation -> the initial caller have the gsm voicemail and the phone of the attended transfert initiative lost the call.

Have you got some informations on a patch or have you got a solution to resolve this case?

Thank you for help !!!