[SR-Users] checking if calls are still active

[marius zbihlei]

On 11/01/2010 05:13 PM, Vic Jolin wrote:
> Hi,
>
> Just want to ask what is the best way to check if calls are still 
> active especially when we are not handling media?
>
> Thanks
Hello

There is SST (Sip Session Timers RFC 4028), which is implemented in the 
SST module, but at least 1 UA must know the extension. Also I have been 
working on a IETF draft  to use end-to-end OPTIONS ping to determine the 
operational status of a UA.(it works well with B2BUA, relatively well 
with stateful proxies). If you are interested I can talk more about the 
draft and how I propose using OPTIONS requests for this.(no changes on 
UAs are necessary)

Marius.