asterisk users - Jun 2005 - Service Unavailble, Sipura 3000, CheckGroup, what the heck??

Folks!

I discovered some serious problem with several Sipuras 3000 but I don't know
if the problem is with them or Asterisk. Basically, if I call a Sipura PSTN
line, when there is a call already in progress, generally I get a 503 Sevice
Unavailable, but if I try hard enough, I am able to get through and connect to
dialed number. The  other call gets disconnected but the originator of the other
call is now on my call. Is this a bug of Asterisk's SIP implementation? or
is it a Sipura configuration problem?
 
I looked at other alternatives but haven't had any luck. Hint didn't
work and CheckGroup does exactly the same thing. Sometimes I get Service
Unavailable but other times i can dial even though there is a call in progress.


Any ideas?

 
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> I discovered some serious problem with several Sipuras 3000 but I don't
know if the problem is
with them or Asterisk. Basically, if I call a Sipura
> PSTN line, when there is a call already in progress, generally I get a 503
Sevice Unavailable,
but if I try hard enough, I am able to get through
> and connect to dialed number. The  other call gets disconnected but the
originator of the
other call is now on my call. Is this a bug of
Asterisk's
> SIP implementation? or is it a Sipura configuration problem?
>  
> I looked at other alternatives but haven't had any luck. Hint
didn't work and CheckGroup does
exactly the same thing. Sometimes I get Service
> Unavailable but other times i can dial even though there is a call in
progress.

Its almost impossible to respond to the above since the spa3k can be
configured in lots of different ways, and can interact with * in lots
of different ways. Since Sipura does not provide a nice way to post
their configs, it makes it even more difficult.

Personally, I've been using a spa3k with * for about nine months, and
really haven't had any problems with it.