[SR-Users] SIP Security handling in Kamailio IMS

[BALL SUN]

Hi

During the testing with Kamailio IMS, we found that SUBSCRIBE and
NOTIFY message flow between UE and P-CSCF is shown below.

SUBSCRIBE and its response: 192.168.1.102:9101 (port-c) ->
192.168.2.66:6101 (port-s)
NOTIFY: 192.168.2.66:5101 (port-c) -> 192.168.1.102:9100 (port-s)

based on the sip security, is it the expected behavior that they are
using port-c and port-s?

The reason why we asked is because we found that the NOTIFY did not
properly propagate to the UE due to different port addresses.

Does anyone have this experience? and how we can resolve it?

- RBK