There are a few threads that talk about this.
You have the option of one nua per line or a single nua and multiplex on 
AOR.
The first option requires each line have a different local UDP port 
number to bind to and a more memory for all the nua contexts.
The second option gives you a single UDP port, but requires you keep 
track of handles per line and multiplex in the callback.

Colin..


Jerry Richards wrote:
> I plan to use Sofia-SIP to develop a multi-line (i.e. multi-AOR) SIP phone
> that has up to 50 individually registered lines, and so it will need to call
> nua_create() once per line.
>
> My question is, how much RAM memory will be required for each line?  How
> many Sofia-SIP processes would be running?
>
>
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