[Asterisk-Users] Re: Strange Problem
radamson at routers.com
Fri Mar 12 13:31:05 MST 2004
> > I am experiencing a strange problem and wanted to know if someone has
> > faced any similar issues or could provide me with a way to counter this
> > problem. I am in the process of experimenting with asterisk and trying
> > to setup a basic functional system. I have one TDM400P (single port) and
> > one X100P. I am using one analog phone connected to the TDM400P and I
> > also have a couple of Xlite SIP phones configured. I can make calls out
> > to the PSTN and I can also receive calls.
> > The problem happens when someone from the outside (PSTN) calls the
> > Asterisk box. I have asterisk configured to forward the call to Zap/2
> > (analog phone). Zap/2 rings and I can talk to the person on the other
> > end but if I hang up first then the other end does not see as the call
> > being hung up. Asterisk CLI shows that Zap/1-1 (FXO) hungup but for some
> > reason the other end thinks that the call is still up and does not
> > disconnect unless the person hangs up himself. The confusing part is
> > that if I initiate the call then this problem does not happen.
> > Can someone tell me what is happening and how to resolve this issue?
> On analog lines, the central ofice switch will signal that the remote
> end hung up the call, if I recall correctly, either by dropping loop
> current or using a brief polarity reversal. There may be other means as
> well. You need to make sure that you are using the correct settings to
> sense this properly.
> The reason you don't see this when you place the call is that,
> obviously, your end has no trouble determining when you have hung up,
> regardless of setting that affect the detection of the remote end
> hanging up.
Just for the record, there seems to be an issue brewing in the sip
channel relative to disconnects.
C7960 -> * -> sip gateway -> pstn
When the C7960 hangs up on a call, we see the 7960 issue a BYE to *,
but * does NOT always send a BYE to the gateway. That's watching closely
with a packet sniffer, all on the same wire, likely loaded SOHO asterisk.
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