calls dropped after session-expires is reach

Discussion in '3CX Phone System - General' started by Luis C, Apr 11, 2018.

  1. Luis C

    Joined:
    Nov 6, 2017
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    Hello,

    conference phones (grandstream GAC 2500) calls are been dropped with 488 Not Acceptable Here.
    The scenario is:
    phone-----------------------------------------------------------3CX----------------------------------------SIPTruk
    INVITE (no sesión-expires) -> INVITE (no sesión-expires)
    ? <- 200 OK (Session-Expires: 1800;refresher=uas)
    ...
    ? <- re-INVITE (Session-Expires: 1800;refresher=uac)
    -> 488 Not Acceptable Here

    The 488 is just generated after 15 minutes of ACK message, that is, when re-INVITE is received by 3CX following the sesión-expires header.

    This is the re-INVITE:
    INVITE sip:1111111111@10.1.6.11:5060 SIP/2.0
    Via: SIP/2.0/UDP 10.1.6.201:5060;branch=z9hG4bK796n5e20cg3lh77cjql0.1
    Max-Forwards: 69
    From: <sip:2222222222@10.1.6.201:5060>;tag=as75b0010d
    To: "G-04 Sala de Consolas"<sip:1111111111@10.1.6.11:5060>;tag=2369252d
    Contact: <sip:g0*2222222222@10.1.6.201:5060;transport=udp>
    Call-ID: _LZlkXDWp-JuAKfFzqRZ6g..
    CSeq: 102 INVITE
    Session-Expires: 1800;refresher=uac
    Min-SE: 90
    Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
    Supported: replaces, timer
    Content-Type: application/sdp
    Content-Length: 273
    v=0
    o=cooper 1438790713 1438790713 IN IP4 10.1.6.201
    s=-
    c=IN IP4 10.1.6.201
    t=0 0
    m=audio 8034 RTP/AVP 0 8 101
    a=rtpmap:0 PCMU/8000
    a=rtpmap:8 PCMA/8000
    a=rtpmap:101 telephone-event/8000
    a=fmtp:101 0-16
    a=silenceSupp:eek:ff - - - -
    a=maxptime:150
    a=sendrecv

    I would like to know how 3CX manage sesión-expires.
    Note I can check this scenario working properly, that is, we have calls with more 15 minutes duration but in these cases calls are dropped.

    Regards,
    Luis Carlos
     
  2. craigreilly

    craigreilly Well-Known Member

    Joined:
    Feb 1, 2012
    Messages:
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    Are you programming manually?
    I have a Template I use for the 2500, and have no complaints of them ever dropping a call.
    I can share if you like.
     
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