Oh, this is getting exciting again. So forget the jack point go right to the exchange...Is this right?
We definatly had problems with echo NOT using the '*' box going sip to sip. Going via an ADSL 'voip' modem using a regular phone to SIP did have echo on my end (SIP end). Just to clarify exchange -> ISDN -> Asterisk - > voip Mother. > No, you're missing the point. A call sentre will at least > use ISDN for access to the real world, probaby a far > larger pipe than that... 145mbit and up. You're using pots > on your prone to ring the call centre, but they're > certainly not using that technology to receive it! > > The main user of cpu in this kind of system is the echo > cancellation - which is why the bigger boards ( analogue > digium tdm2400p / digital te412p for example ) support > that on-board. > > > Steve > > On Sun, 01 Oct 2006 22:29:30 +1300 > Jason Mumby <[EMAIL PROTECTED]> wrote: > > > So...ahem, at best one box can handle 4 calls at a time? > > That seems a bit lean. I mean call centers must take > > hundreds of calls an hour. I figure this probably isn't > > going to work on a large scale! > > Hadley Rich wrote: > > > On Sunday 01 October 2006 21:55, Jason Mumby wrote: > > > > > >> Well I was thinking of having a server in the three > > main centers. My >> brother has set up a server in > > Auckland I have a brother in wellington >> so should be > > ok. I am impressed with the quality and don't pretend to > >> understand the the technology but it is a hack job, but > > we have only run >> it on the weekend! The major thing I > > figure is how many analogue calls a >> box can take. > > Like can a FXO card only handle one call at a time? >> > > > > > > A single FXO can only handle one call at a time since > > > one FXO is plugged into one analog line. > > > > > > How many calls a box can take depends on the spec of > > > the box and the PSTN interface hardware you choose. > > > > > > You can go with internal hardware like a TDM400P which > > > can handle up to four lines (with 4 FXO modules). You > > > can put multiple cards in some boxes (they generate > 1000 interrupts per second so some boards can't handle > > > more than one). There are also higher density boards > > > such as the TDM2400P or the Sangoma A200. > > > > > > You could also go with external gateways which convert > > > PSTN to SIP so you don't need any hardware in the > > actual box. > > > > If you are going to use anything above around 6 lines > > > then you should definitely be looking into an ISDN > > > service - which is a better service anyway due to the > > signalling being out of band. > > > > There is also the option of going with external SIP > > > origination from a provider. > > > > > > hads > > > > > > > > >
