[Asterisk-Dev] Re: multiple registrations of same credentials

[Kevin Hanson]

Michael Procter wrote:

>Kevin Hanson wrote:
>  
>
>>The major problem with shared extension appearances in Asterisk is 
>>having to set your call-limit to 1 for the monitored phones.  Those 
>>phones can then no longer have a second call come in (call waiting), 
>>place a call on hold and make another call, or transfer calls as they 
>>are limited to the call they are on.
>>
>>I installed a Polycom 601 w/ sidecar for a customer and the 
>>call-limit 
>>limitation was a show stopper.  Bascially, all the sidecar 
>>gets them is 
>>an easy way to transfer incoming calls via speed dial setup on the 
>>sidecar.  For now I've placated them w/ Flash Operator Panel.
>>
>>Is this a limitation of SIP or will Asterisk be able to support 
>>extension appearances without the call-limit in the future?
>>    
>>
>
>An approach to shared lines/bridged lines is documented in:
>http://www.ietf.org/internet-drafts/draft-anil-sipping-bla-02.txt
>
>This supports multiple appearances on the same AOR, i.e. more than
>one call at a time.
>
>Polycom are listed in the acknowledgements section of this draft,
>so you might find that they support this draft in some form or another.
>
>Regards,
>
>Michael Procter
>  
>
I was aware of Polycom's support of shared line appearances, but I don't 
think Asterisk supports it.  Kevin Fleming said earlier in this thread:

"Shared line appearances are hard to implement with Asterisk, and even 
harder to understand when the concept of a 'line' does not really exist 
at all (like when VOIP trunks are in use). We have talked about ways of 
getting there, but it will not be easy."

Asterisk uses presence, hints, and call-limit to provide shared 
*extension* appearance, but it brings with it the limitation I cited above.

Thanks,
Kevin