[SR-Users] Session timers

[Eric Koome]

How do I process session timers in Kamailio coming from particular upstream provider every 15mins during a call?

At the moment the the call fails after 15 mins.

Related to this, another provider sends re-invites during a dialog to check that my kamailio is alive. However Kamailio responds with "488 not here". How do I process these as well?

Asterisk sits behind Kamailio.

Thanks 

Eric