Hi, thank you for the quick response! And see the problem right now but be honest with you - in our test lab we never met this behavior of the P-CSCF. The P-CSCF sends SUBSCRIBE generated from itself (with Contact: <sip: pcscf-int-1 .ims.mnc001.mcc001.3gppnetwork.org> and Call-ID 7fb844aa6636e93a-173@192.168.178.92) and there is a problem with my fix. The fix is working for the SUBSCRIBE coming from the UE. Could you please give us some more details about the P-CSCF configuration for the current test. Especially for the part with the SUBSCRIBE generated from the P-CSCF.
Thank you!