[SIPForum-discussion] Forcing Re-Registration

[Tomasz Karbowski]

This has a bad point.
Thats true i am working with a client of us who uses IMS and when they  
register they always send SUBSCRIBE with event: reg to know when other  
person registered on same account and their registration was overrided  
(the interface knows that its not registered anymore because it gets a  
NOTIFY).

The problem is when there is unstable network connection and we use UDP.
Expires like 3600 seconds is bad in such situation and the client may not  
know he loose internet connection - registration will be still on server.

In case of TCP client and server may check the connection status and  
expires like 3600 are not so bad. When client looses TCP there are two  
situations :
- one would be closing TCP connection - registration immediately dissapear  
 from server
- client looses internet connection (TCP connection as well) - server  
would remove registration after some timeout, when internet connectivity  
is back client should know that he need to re-register.



W dniu .02.2014 o 16:42 Paul Kyzivat <pkyzivat at alum.mit.edu> pisze:

> I'm not an IMS expert, but IIUC in IMS they may forcibly unregister an
> endpoint prior to registration expiration. The endpoints know this can
> happen, and depend upon a reg event subscription to notify them that
> this has happened. Then they can attempt to re-register.
>
> I think they do this because keeping the registration interval short is
> costly on battery life and radio usage.
>
> 	Thanks,
> 	Paul
>
> On 1/30/14 2:23 PM, Aniella Juverdeanu wrote:
>> Expires timer should be the only mechanism – change the value to what is
>> needed to force re-registration.
>>
>> *From:*discussion-bounces at sipforum.org
>> [mailto:discussion-bounces at sipforum.org] *On Behalf Of *Premchandiran
>> *Sent:* January 29, 2014 07:39 PM
>> *To:* discussion at sipforum.org
>> *Subject:* [SIPForum-discussion] Forcing Re-Registration
>>
>> Hi All,
>>
>> May I know how to force client to send Re-Registration request , Is
>> there anyway apart from keeping expires minimum? .
>>
>> Thanks in advance.
>>
>> Regards,
>>
>> *Prem Chandiran M***
>>
>>
>>
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>
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