The scenario, as I see it, is that - the call is parallel-forked from kamailio to B1 and B2 - B1 answers the call and this works fine - Kamailio sends a CANCEL to B2, but this CANCEL gets lost - B2 answers the call - B2 sends a BYE and kills the call

The user A should be responsible for handling this situation (it should BYE the call to B2 when it gets the 200-OK).

Miconda answered this a few years ago here. https://github.com/kamailio/kamailio/issues/570

James

On Wed, 30 Mar 2022 at 05:36, Koray Vatansever koray.vatansever@gmail.com wrote:

Hi,

I would appreciate if anyone has any suggestions regarding the following?

On Thu, Mar 24, 2022 at 3:38 PM Koray Vatansever koray.vatansever@gmail.com wrote:

...

Hi everyone,

I'm facing the following situation.

Clients are connected over TLS. Therefore there is no retransmission in Kamailio.

How can I prevent this call drop?

+---+ +-----------+ +-----+ +-----+ | A | | Kamailio | | B1 | | B2 | +---+ +-----------+ +-----+ +-----+ | | | | | INVITE | | | |------------------------------------>| | | | | -------------------\ | | | |-| Parallel forking | | | | | |------------------| | | | | | | | | INVITE | | | |---------------------->| | | | | | | | INVITE | | | |--------------------------------------------------->| | | | | | | 180 Ringing | | | |<----------------------| | | | | | | | | 180 Ringing | | |<---------------------------------------------------| | | | ------------------------\ | | | |-| User answers the call | | | | | |-----------------------| | | | | | | | 200 OK | | | |<----------------------| | | | | | | 200 OK | | | |<------------------------------------| | | | | | | | ACK | | | |------------------------------------>| | | | | | | | | ACK | | | |---------------------->| | | ------------------------------\ | | | |-| Session established with B1 | | | | | |-----------------------------| | | | | | | | ----------------------------\ | | | |-| Client changes network | | | | | | LTE to Wifi or vice versa | | | | | | Temporary connection lost | | | CANCEL | | |---------------------------| | |----------------------------------------------X | | | | | -------------------------------------------------\ | | | |-| Reconnected with different IP | | | | | | CANCEL is missed and client continues ringing. | | | | | | User answers the call. | | | | 200 OK | |------------------------------------------------| | |<---------------------------------------------------| | | | | | 200 OK | | | |<------------------------------------| | | | | | | | | | BYE | | |<---------------------------------------------------| | | | | | BYE | | | |<------------------------------------| | | | ---------------------------\ | | | |-| Session terminated by B2 | | | | | | Call Drop | | | | | |--------------------------| | | |

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