Hello,

I can reproduce the issue, with kamailio 4.4.6+jessie from kamailio debian repository:

server1 (REGISTER message):

DEBUG: usrloc [ucontact.c:1692]: update_ucontact(): exists callback for type= UL_CONTACT_UPDATE
DEBUG: usrloc [ul_callback.h:84]: run_ul_callbacks(): contact=0x7f0096e0b548, callback type 2/15, id 0 entered
DEBUG: dmq_usrloc [usrloc_sync.c:578]: dmq_ul_cb_contact(): Callback from usrloc with type=2
DEBUG: dmq_usrloc [usrloc_sync.c:548]: usrloc_dmq_send_contact(): sending serialized data {"action":1,"aor":"+33564093848","ruid":"uloc-5a86b8c5-31e0-2","c":"sip:+33564093848@xxx:41502;ob","received":"","path":"","callid":"ntoWjs3R3WpP9Z5rsi7Npmr2rRGKstls","user_agent":"CSipSimple_porridge-23/r2457","instance":"","expires":1518779539,"cseq":55952,"flags":0,"cflags":0,"q":-1,"last_modified":1518778639,"methods":8159,"reg_id":0}
DEBUG: dmq_usrloc [usrloc_sync.c:299]: usrloc_dmq_send(): sending dmq broadcast...

server2 (DMQ recipient):

DEBUG: dmq_usrloc [usrloc_sync.c:327]: usrloc_dmq_handle_msg(): dmq message received from sip:usrloc@172.16.67.15:5060
DEBUG: dmq_usrloc [usrloc_sync.c:429]: usrloc_dmq_handle_msg(): Received DMQ_UPDATE. Update contact info...
DEBUG: dmq_usrloc [usrloc_sync.c:64]: add_contact(): aor: +33564093848
DEBUG: dmq_usrloc [usrloc_sync.c:65]: add_contact(): ci->ruid: uloc-5a86b8c5-31e0-2
DEBUG: dmq_usrloc [usrloc_sync.c:66]: add_contact(): aorhash: -1799456359
DEBUG: dmq_usrloc [usrloc_sync.c:72]: add_contact(): Found contact
DEBUG: usrloc [ucontact.c:1692]: update_ucontact(): exists callback for type= UL_CONTACT_UPDATE
DEBUG: usrloc [ul_callback.h:84]: run_ul_callbacks(): contact=0x7f3900243bd0, callback type 2/15, id 0 entered
DEBUG: dmq_usrloc [usrloc_sync.c:578]: dmq_ul_cb_contact(): Callback from usrloc with type=2
DEBUG: dmq_usrloc [usrloc_sync.c:600]: dmq_ul_cb_contact(): Contact received from DMQ... skip
DEBUG: usrloc [ucontact.c:1004]: db_update_ucontact_ruid(): ruid:uloc-5a86b8c5-31e0-2
DEBUG: usrloc [ucontact.c:1133]: db_update_ucontact_ruid(): contact:sip:+33564093848@xxx:41502;ob
DEBUG: dmq_usrloc [usrloc_sync.c:74]: add_contact(): Release record
DEBUG: dmq_usrloc [usrloc_sync.c:76]: add_contact(): Unlock udomain

the recipient receive an UPDATE message only.
according to usrloc_sync.c:usrloc_dmq_handle_msg(), UPDATE message add the new contact only (execute add_contact()), but the other one is not deleted

and there is no DMQ_RM message generated from the emitter

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