[Serusers] SER with Multiple Contact

Klaus Darilion klaus.mailinglists at pernau.at
Thu Mar 25 15:41:30 CET 2004



Alex Bligh wrote:
> 
> 
> --On 25 March 2004 12:45 +0100 Klaus Darilion 
> <klaus.mailinglists at pernau.at> wrote:
> 
>>> I've configured a local SER on our network, and I met some difficulties
>>> with multiple Contacts.
>>> When UA1 changes IP address, and REGISTER in SER to announce his new IP,
>>> both last and New Contacts are placed in Location table, with different
>>> 'expires' values. If UA2 receives last UA1 IP address, and REGISTER with
>>> it, calling UA1 from UA3 when both Contact still available, makes UA2
>>> ringing, which cause some confusion.
>>>
>>
>> That's a fault of the UA. The UA should un-REGISTER the old contact
>> before registering a new one.
> 
> 
> Not necessarily. For instance consider UA1 and UA2 are identical UAs on
> different DSL lines. They get dynamic IP. The DSLAM reboots. Lines come
> back up slowly. If ser gets a valid register request for UA1, it seems
> to me it should remove all trace of the old IP address ASAP, as "I am
> here" rather implies "I am not there (where there != here)".
> 

It depends - if I have a SIP phone on my desk and a softphone on my 
notebook, booth should be registered and reachable.

klaus




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