[Serusers] SER with Multiple Contact

Jiri Kuthan jiri at iptel.org
Thu Mar 25 14:40:46 CET 2004


At 01:27 PM 3/25/2004, 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)".

How would you like to distinguish a parallel registration from from 
reregistration behind a changed IP address?

-jiri 




More information about the sr-users mailing list