[asterisk-users] SIP - busy tone detection

[Asterisk]

Hi guys,

My Asterisk box is connected to a VoIP provider using SIP protocol. Unforunately, when I try to call a number that is busy, the provider plays "busy" tones for 15 seconds and than hungups the call with dialstatus=CHANUNAVAIL, instead of dialstatus=BUSY.

Is there any way to detect busy tone pattern on a SIP call (are there any SIP equvalents of busydetect and busycount parameters)?

Thanks, Alex