No.     Time        Source                Destination           Protocol Info
    881 14.964563   192.168.1.10          192.168.1.15          SIP      Status: 180 Ringing

Frame 881 (490 bytes on wire, 490 bytes captured)
Linux cooked capture
Internet Protocol, Src: 192.168.1.10 (192.168.1.10), Dst: 192.168.1.15 (192.168.1.15)
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Status-Line: SIP/2.0 180 Ringing
    Message Header
        Via: SIP/2.0/UDP 192.168.1.15;branch=z9hG4bK6008414cefae770f
        Via: SIP/2.0/UDP 192.168.1.11;branch=z9hG4bK6008414cefae770f
        Record-Route: <sip:192.168.1.15;lr=on;ftag=82109cffc4d06068>
        From: <sip:+41215509999@192.168.1.15>;tag=82109cffc4d06068
        To: <sip:+41215501111@192.168.1.15>;tag=b46457f322c1e961
        Call-ID: d0f0a4e0cfa0590b@192.168.1.11
        CSeq: 50933 INVITE
        User-Agent: Grandstream BT110 1.0.8.33
        Content-Length: 0