Incoming call rejected (420 Bad Extension)

Discussion in '3CX Phone System - General' started by kot2003, Sep 25, 2011.

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  1. kot2003

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    The call comes from VoIP provider to 3CX:

    User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
    Session Initiation Protocol
    Request-Line: INVITE sip:774724982@3CX_IP_address:5060;rinstance=500f6aa057177b13 SIP/2.0
    Message Header
    Via: SIP/2.0/UDP VoIP_provider_IP:5060;branch=z9hG4bK-4e67792e-441612
    To: <sip:774724982@3CX_IP_address:5060;rinstance=500f6aa057177b13>
    From: <sip:33072502@VoIP_provider_IP>;tag=8624386
    Call-ID: 1315404078-436545@SIP
    CSeq: 1 INVITE
    Sequence Number: 1
    Method: INVITE
    Max-Forwards: 70
    Contact: <sip:33072502@VoIP_provider_IP:5060>
    Require: 100rel
    Expires: 330
    Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, PRACK, REFER, SUBSCRIBE, NOTIFY, UPDATE, REGISTER
    Accept: application/sdp
    Content-Type: application/sdp
    Content-Length: 343
    Message Body
    Session Description Protocol
    Session Description Protocol Version (v): 0
    Owner/Creator, Session Id (o): - 268883969 1316944546 IN IP4 VoIP_provider_RTP_IP
    Session Name (s): -
    Connection Information (c): IN IP4 VoIP_provider_RTP_IP
    Time Description, active time (t): 0 0
    Session Attribute (a): sendrecv
    Media Description, name and address (m): audio 7480 RTP/AVP 8 18 101
    Media Attribute (a): rtpmap:8 PCMA/8000
    Media Attribute (a): rtpmap:18 G729/8000
    Media Attribute (a): fmtp:18 annexb=no
    Media Attribute (a): cdsc:1 image udptl T38
    Media Attribute (a): rtpmap:101 telephone-event/8000
    Media Attribute (a): fmtp:101 0-15
    Media Attribute (a): silenceSupp:eek:ff - - - -
    Media Attribute (a): ptime:20
    Media Attribute (a): maxptime:30
    Media Attribute (a): rtcp-xr:

    The call is rejected:

    User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
    Session Initiation Protocol
    Status-Line: SIP/2.0 420 Bad Extension
    Message Header
    Via: SIP/2.0/UDP VoIP_provider_IP:5060;branch=z9hG4bK-4e67792e-441612
    To: <sip:774724982@3CX_IP_address:5060;rinstance=500f6aa057177b13>;tag=2935a94d
    From: <sip:33072502@VoIP_provider_IP>;tag=8624386
    Call-ID: 1315404078-436545@SIP
    CSeq: 1 INVITE
    Sequence Number: 1
    Method: INVITE
    Unsupported: 100rel
    Content-Length: 0

    Any ideas? Why 3CX answers with "Unsupported: 100rel" ?

    Regards,
    Pavel
     
  2. SY

    SY Well-Known Member
    3CX Support

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  3. kot2003

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    Thank you,

    So, the bottom line - this is is not supported. I have to ask my VoIP provider not to send "Require: 100rel".

    Best regards,
    Pavel
     
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