[asterisk-users] Asterisk pass a call to status answer while still ringing

[antselva]

Hi,

I have a problem with dialing status.
I'm using Asterisk 1.6 and a patton 4554 gateway for ISDN calls.
When I call fixed telephone (not mobile phone) after few ringing the 
status change to "answer" but the phone is still ringing, so if I hangup 
before someone really answer, the call is reported as answered but it isn't.
This gives me problem for call charge.

Some I idea what can be?

Thanks in advance

Selva