[asterisk-users] Odd bug in Siemens C460IP ?

[Paul Hayes]

Robert Lister wrote:
> Hello,
> 
> I think I have encountered an odd bug in Siemens C460 IP/dect handsets, 
> which is a bit annoying, and I'm not (yet) sure how to get round it without 
> lots of hacks.
> 
> Basically, on all external incoming calls, we set:
> 
> exten => s,n,SIPAddHeader(Alert-Info: Bellcore-dr2)
> 
> This causes handsets (i.e. Cisco 7960 / Grandstream / aastra) to set a 
> different ring cadence so to differentiate between external and internal 
> calls.
> 
> Other handsets that do not support Alert-Info: just ignore the presence 
> of this header.
> 
> When this header is set in a call to the C460 IP, it does not alert, in fact 
> it does not respond to any INVITE requests; asterisk just retries the 
> requests a few times and then gives up.
> 
> Anyone able to reproduce?  I have firmware version 010700000000 / 041.00
> 
> I suppose as a workaround I could add an astDB entry for these extensions, 
> and a bit of logic in the dialplan to tell asterisk not to add the header 
> for extensions that have that flag set.
> 
> 
> Regards,
> 
> 
> 
> Rob
> 
> 

I can replicate this behaviour too using an S450IP when an Alert-Info 
header is present.  I have reported the issue to Siemens so hopefully 
this will be fixed in a firmware update in the near future.

cheers,
Paul.