[Serusers] SIP Priority, Call priority

[Victor Pascual Ávila]

On Tue, Jun 9, 2009 at 4:25 PM, Nils Ohlmeier<lists at ohlmeier.org> wrote:
> Hi Paolo,
>
>> Hello,
>> i'm new in this SER world, but i'm using OpenIMSCore, based on SER.
>>
>> i'm wondering if SER can handle some kind of prioritization, to serve some
>> special SIP messages before others.
>>
>> I'm thinking about a Commandant who wants to have a high priority call,
>> inside a tactical network; His call has to be served before any others by
>> the sip servers.
>>
>> Do you know anything about this?
>
> I know that this requirement from some agencies exists since a long time.
> But in my opinion it is more or less technical non-sense in a packet
> switched world.
>
>> i read something about "resource-priority" inside SIP header, but i don't
>> know is SER can understand it.
>
> To cite from RFC4412 section 4.5.1:
>
>   As noted
>   above, the processing of SIP requests itself is not preempted.  Thus,
>   since proxies do not manage sessions, they do not perform preemption.
>
> So SER does not need and can not support preemption. And internal priority
> queueing is not supported by SER either.

I think this is something desirable for session-aware servers--
specially when considering internal overload control mechanisms.

Cheers,
-- 
Victor Pascual Ávila