Status UNREACHABLE but some line are OK on the same phone

FreePBX 13 / Asterisk 11

Cisco SPS 303 (3 lines)
Line 1: 318 - Status : OK (78 ms)
Line 2: 319 - Status : UNREACHABLE
Line 3: 320 - Status : OK (78 ms)

How can Line 1 and 3 be OK and not line 2

  • Name : 319
    Description :
    Secret :
    MD5Secret :
    Remote Secret:
    Context : from-internal
    Record On feature : automon
    Record Off feature : automon
    Subscr.Cont. :
    Language : en
    Tonezone :
    Accountcode : Platypus
    AMA flags : Unknown
    Transfer mode: open
    CallingPres : Presentation Allowed, Not Screened
    Callgroup :
    Pickupgroup :
    Named Callgr :
    Nam. Pickupgr:
    MOH Suggest :
    Mailbox :
    VM Extension : *97
    LastMsgsSent : 32767/65535
    Call limit : 2147483647
    Max forwards : 0
    Dynamic : Yes
    Callerid : “319” <319>
    MaxCallBR : 384 kbps
    Expire : 3479
    Insecure : no
    Force rport : Yes
    Symmetric RTP: Yes
    ACL : Yes
    DirectMedACL : No
    T.38 support : No
    T.38 EC mode : Unknown
    T.38 MaxDtgrm: 4294967295
    DirectMedia : No
    PromiscRedir : No
    User=Phone : No
    Video Support: No
    Text Support : No
    Ign SDP ver : No
    Trust RPID : Yes
    Send RPID : Yes
    TrustIDOutbnd: Legacy
    Subscriptions: Yes
    Overlap dial : Yes
    DTMFmode : rfc2833
    Timer T1 : 500
    Timer B : 32000
    ToHost :
    Addr->IP : 70.30.10.123:5061
    Defaddr->IP : (null)
    Prim.Transp. : UDP
    Allowed.Trsp : UDP
    Def. Username: 319
    SIP Options : (none)
    Codecs : (gsm|ulaw|alaw|g726)
    Codec Order : (ulaw:20,alaw:20,gsm:20,g726:20)
    Auto-Framing : No
    Status : UNREACHABLE
    Useragent : Cisco/SPA303-7.5.5
    Reg. Contact : sip:[email protected]:5061
    Qualify Freq : 60000 ms
    Keepalive : 0 ms
    Sess-Timers : Accept
    Sess-Refresh : uas
    Sess-Expires : 1800 secs
    Min-Sess : 90 secs
    RTP Engine : asterisk
    Parkinglot :
    Use Reason : No
    Encryption : No

    Status : UNREACHABLE
    Useragent : Cisco/SPA303-7.5.5
    Reg. Contact : sip:[email protected]:5061
    Qualify Freq : 60000 ms
    Keepalive : 0 ms
    Sess-Timers : Accept
    Sess-Refresh : uas
    Sess-Expires : 1800 secs
    Min-Sess : 90 secs
    RTP Engine : asterisk
    Parkinglot :
    Use Reason : No
    Encryption : No