MS,BSS village A MSC,MGW village A osmo-sip-connector village A PBX village A OsmoHLR village B osmo-sip-connector village B MGW,MSC village B RAN,MS village B CC Setup MNCC_SETUP_IND SIP INVITE dialplan: launch mslookup by MSISDN multicast-DNS query to all connected sites mDNS response (age) wait ~ 1s for more mDNS responses SIP INVITE (MT) MNCC_SETUP_REQ Paging (CC) voice call commences