"Andrew Gabriel" <andrew@cucumber.demon.co.uk> wrote in message
news:46e09737$0$661$5a6aecb4@news.aaisp.net.uk...
> In article <46e03184$0$226$e4fe514c@news.xs4all.nl>,
> "Christian" <myfirstnamehere.2007@xs4all.nl> writes: 
>
> This is called busying out the line, and is a standard feature
> on all telco POTS telephony systems.
> 
>
> There is no SIP message to busy out a line, so it's not something
> a VoIP unit can support using SIP protocol alone.
> 
>
> --
> Andrew Gabriel
> [email address is not usable -- followup in the newsgroup]

So how come my Fritzbox can do this?  It rejects calls on busy, which then
relies on how the SIP provider handles this.  This could be a busy tone or
it could be divert to voicemail.  It can also be an NU tone (e.g. Sipgate)!

I seem to remember there is a "Busy here" message through SIP?

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