[Asterisk-Users] Dial to a SIP fone ends up at Voicemail Busy

[C F]

are these phones behind nat?

On 5/24/05, Arnd Vehling <av at nethead.de> wrote:
> Hi,
> 
> some of my sip fones which have several external numbers assigned
> are not reachable after a certain timespan. Instead of the fone the
> Voicemailbox is trigger in "busy" mode. After a reboot if the sip-fone
> the problem goes away for some time. Ive seen this problem with Sipuras
> and Grandstreams.
> 
> Any ideas?
> 
> cheers,
> 
>    Arnd
> 
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