[SR-Users] Re-establishment of a closed TCP connection

[Richard Edmands]

Have you considered some sort of keep-alive packet?
Usually the phones can be configured to send these, if not then you could write something up in Kamailio to send them every 5 minutes or so.

> On 9 Jun 2022, at 5:04 pm, Daniel-Constantin Mierla <miconda at gmail.com> wrote:
> 
> Hello,
> 
> there is no tight relation between sip traffic and transport
> connections, meaning that you can can enforce any target address when
> sending requests within dialog via config operation.
> 
> By default kamailio.cfg processing, the connection is matched based on
> Route or R-URI addresses. But you can set the target address in $du to
> point to port 5060 and then relay.
> 
>> On 08.06.22 12:41, Vitalii Krutsitskyi wrote:
>> Hello
>> 
>> General overview of the infrastructure:
>> Client (Cisco Hardware) ---> AWS NLB ---> Kamailio Instances
>> 
>> The client has a time limit for the opened TCP connections - 10
>> minutes. This is a hardcoded value that can't not be changed.
>> Regardless of the traffic that flows through the connection, it is
>> closed after 10 minutes.
>> 
>> Problem: in case of long-running calls above 10 minutes it is not
>> possible for Kamailio to send back SIP traffic back to the client
>> using the original TCP connection. The client has been asked to either
>> increase the time limit or send SIP reinvites - none of that is
>> possible due to some client's infrastructure limitations.
>> 
>> Question: is it possible to force Kamailio to open a new TCP
>> connection and associate it with the call? Client has a 5060 port
>> always opened which can accept incoming connections.
>> 
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> 
> -- 
> Daniel-Constantin Mierla -- www.asipto.com
> www.twitter.com/miconda -- www.linkedin.com/in/miconda
> Kamailio Advanced Training - Online: June 20-23, 2022
>  * https://www.asipto.com/sw/kamailio-advanced-training-online/
> 
> 
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