[Asterisk-Users] FXO hangup delay...

[Nahid Hossain]

Hello,
I am facing hangup delay problem using FXO (X100P) card with the following 
scenario: 

PSTN Phone--------->BTTB PSTN Gateway------->Asterisk BOX-FXO-------->SIP 
Endpoint 

When anyone make call to my Asterisk-BOX FXO, they gets IVR to press their 
desired SIP extension number. If calling party disconnect the his/her call 
before pick up the call by the called party, then called party extension 
rings for 40 to 45 seconds. I suspect Asterisk-BOX FXO can't detect hangup 
signal properly. May be there is some mis match with my selected loadzone in 
zaptel.conf. FYI, I tried to set different busycount value, but it doesn't 
work and I didn't get any difference with this. 

Anyway, how can I know my actual tone zone for PSTN line? I am using 
Asterisk in Bangladesh. I need to know BTTB tone frequencies like Dial, 
Congestion, Busy, Ring tone frequencies to make compatible with my FXO card. 
Is there any tools that I can measure my actual BTTB line's frequencies to 
write proper indications.conf file? 

I would appreciate if anyone give me any solution for the above problem. 

N.B. In Bangladesh BTTB is like Telco. A PSTN line provider. 


Regards
Nahid