[asterisk-dev] PSTN Hangup Problem with Asterisk

[Chan Kwang Mien]

Hi Leo,

Thanks for the suggestion. I am doing the test in Japan. 
the loopstart with busycount did make a difference. 
When the Cell Phone hangs up, I notice that it took Asterisk about 3-4
secs to display the "Hangup Zap/1-1" message. 

Is this the shortest time that Asterisk could achieve ? Would it be
possible for Asterisk to immediately display the Hangup message ?

regards,
Kwang Mien

> Quoting Chan Kwang Mien <kwangmien at asgent-tech.com>:
> 
> > Hi,
> >
> > sipphone <--> Asterisk <--> PSTN <--> Cell Phone
> >
> > Cell Phone calls sipphone. When Cell Phone hangs up,
> > Asterisk shows "Hangup Zap/1-1" immediately.
> >
> > However, there is hangup problem for the following case :
> >
> > sipphone calls Cell Phone. When Cell Phone hangs up, it took about
> > 1 minute for the message "Hangup Zap/1-1" to show up.
> >
> >> From the debug logs of wctdm, I could see the following immediately.
> >
> > Aug 16 16:41:03 localhost kernel: 70132 Polarity reversed (-1 -> 1)
> > Aug 16 16:41:43 localhost kernel: 80319 Polarity reversed (1 -> -1)
> >
> > My guess is that the hangup is detected immediately by the wctdm driver.
> > But Asterisk wasn't able to detect the hangup immediately. Could it be
> > that wctdm did not inform Asterisk of the Hangup ?
> 
> Are you using loopstart or kewlstart? If you're in Singapore, you  
> should use loopstart. From my own experience, kewlstart partly works  
> but can generate strange polarity reversed conditions. During those  
> states, Asterisk gets confused about the line's actual state. These  
> are the issues I've experienced when using fxs_ks signalling:
> a) hangup is not detected, or
> b) hangup is detected as a hangup followed by a new call.
> 
> Changing the signalling to fxs_ls and using busydetect=3, everything  
> went away.
> 
> Hope this helps.
> 
> Leo
> 
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