Hi All
I have recently downloaded Asterisk and was so impressed I thought I would setup a home server and I went out and got myself a couple of cisco 7940's. (and a sipaura 3000!). thanks to various posts on this list and the voip-info site I have managed to get chan_sccp setup and working with the 7940's but the I tried to get the messages, services and softkeys working. It seems this is where some sort of black magic needs to be used as I cannot find any way of getting them to work.... which leads me to the main question....
Is it better to use chan_sccp or SIP? I know these phones can work in either mode I was just wandering which is the better format and which has the most functions implemented?
Its a simple home environment that I am planning but it would be good to be able to use the softkeys to transfer calls and to pickup messages.
Thanks in advance,
Sam
Kevin Walsh <[EMAIL PROTECTED]> wrote on 27/08/2004 13:59:09:
> Michael Manousos [EMAIL PROTECTED] wrote:
> > Kevin Walsh wrote:
> > > Michael Manousos [EMAIL PROTECTED] wrote:
> > > > a) The transmitter detected silence and sent nothing but the last CN
> > > > packet was lost. According to the above interpretations, the receiver
> > > > will try to conseal a packet loss, which is wrong.
> > > >
> > >
> > > I would propose that after x lost packets, Asterisk should treat
> > > all further lost packets as CN. The proceeding x packets should be
> > > interpreted as RTP packet loss and run through the concealment routine.
> > >
> > Well, no matter what kind of concealment algorithm is used, just the
> > first one or two packets will be concealed. The rest losses will result
> > in no-playback. No CN interpretation, just absolute silence.
> >
> That's true - unless there's some logic to say that after x lost
> packets, the line state should switch to CN generation instead of
> silence.
>
> The line state would switch back once a fresh RTP packet is received.
>
> > > >
> > > > b) The transmitter sent an RTP packet, that packet was lost and the
> > > > last packet correctly received at the receiver was a CN packet. Again,
> > > > following the above interpretation, the receiver will do nothing (or
> > > > more accurate, will play some background noise), while it should
> > > > conseal the packet loss.
> > > >
> > > In this case, there is nothing to conceal anyway, as the last received
> > > data was a CN packet. In this case, the CN state should be continued
> > > until an RTP packet is received and the line state can be changed.
> > >
> > Exactly. So the receiver, in case of no-receiption, should go back and
> > see what was the last packet correctly received and act as I described
> > above.
> >
> Maintaining an audio state flag (CN/RTP) would be the key here.
>
> > >
> > > The difficult part to handle would be late or out-of-sequence RTP
> > > packets. These should be ironed out by the jitter buffer. Late,
> > > lost and juggled packets are to be expected when dealing with UDP.
> > >
> > Actually this is not so difficult, if there is a jitter buffer.
> >
> Right.
>
> --
> _/ _/ _/_/_/_/ _/ _/ _/_/_/ _/ _/
> _/_/_/ _/_/ _/ _/ _/ _/_/ _/ K e v i n W a l s h
> _/ _/ _/ _/ _/ _/ _/ _/_/ [EMAIL PROTECTED]
> _/ _/ _/_/_/_/ _/ _/_/_/ _/ _/
>
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