Kamailio takes care of sending in-dialog keep-alives using OPTIONS when dlg_set_attribute ka-src and ka-dst is used. It also sends OPTIONS to correct address if a client sends Re-Invite indicating a network change, which is a common case with mobile clients (switching between mobile-data and Wifi) fixed in #273
The problem is that it ends the dialog on missing even one keep-alive response. Missing a response is possible when the client is handling the network change and keep-alive is sent around that time.

Thus, having a configurable counter after which you expect to end the dialog might be helpful. For eg. you decide to end the dialog after we miss 3 responses for keep-alives in a row.

Something like dlg_set_attribute(ka-src, 3) where 3 indicates the number of responses that can be missed before ending the dialog.

—
Reply to this email directly or view it on GitHub.