[SR-Users] Detection of broken TCP connections to clients

[Yufei Tao]

Hi Daniel

Thanks very much for your response! Now I can see that there may not be
any relation between a stream connection and user availability - I was
assuming a user is registered using one device only, which may not
always be the case in fact.

Yufei

On 10/02/12 14:16, Daniel-Constantin Mierla wrote:
> Hello,
>
> On 2/9/12 3:51 PM, Yufei Tao wrote:
>> Hi
>>
>> When clients register to Kamailio over TCP/TLS, if I set
>> tcp_connection_lifetime to be quite small, like 30 seconds, and let
>> clients send refreshes every 20 seconds, for example. When client
>> crashes or have network problems, the TCP connection with Kamailio will
>> be closed by the server after 30 seconds of being idle.
>>
>> My question is, is there a way of letting Kamailio tell which user the
>> broken TCP connection belongs to, and then remove the user from the
>> location table and update presence information etc?
>>
>> The reason I want this is, if a user publishes its status of being
>> online with expiring time of 1 hour, but then crashed, then the location
>> table entry and presence information of this user would be wrong for the
>> rest of the hour. How do I get around this? I assume server can send
>> periodic OPTION messages but that would be a bit expensive.
> for the moment, no, there is no auto-unregistration when a stream
> connection is closed.
>
> In SIP is no relation between a stream connection and user
> availability. The server can connect back to the client, if no active
> connection can be reused. Of course, this has problems with nat, the
> reason for having the cfg functions set_forward_no_connect() and
> set_reply_no_connect(). Also, a presence state is not related to
> registration state, they can be handled by different instances, via
> different connection.
>
> The connection id is available at registration time, but not stored in
> location table. If one wants to implement such feature, probably would
> not be complex at all.
>
> Cheers,
> Daniel
>
--
Yufei Tao
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