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405 Method Not Supported on External Extension

Discussion in '3CX Phone System - General' started by Ryandc, Jun 18, 2008.

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  1. Ryandc

    Joined:
    Aug 13, 2007
    Messages:
    70
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    System Details:
    Build 5.1.4510
    Windows Server 2003
    One network-facing IP (192.168.0.12), one Internet-facing IP (64.50.120.xx), both statically assigned
    IPSEC is enabled on the public IP so that only specified IPs and protocols can get through.

    Problem:
    I have one external extension that registers through that Internet-facing IP. Her phone, too, is behind a NAT device. STUN is enabled on the phone. After her extension registers, I can pick up a local extension (225), dial her extension (408), and the call is completed without a problem. Two-way audio is clear with no latency.

    However, if SHE picks up the phone and tries to dial an extension, the recipient extension will ring but no audio is transmitted in either direction after the phone is picked up.

    I know if I can call her (local to remote), it's probably not a firewall issue on her end. Likewise, as I'm running IPSEC and no firewall on my end and her phone can register fine, it's not a firewall issue on my end.

    How do I resolve this?

    Logs:
    Ethereal capture of what I suspect the problem is:
    This is the Notify packet being sent from her phone to my phone
    No. Time Source Destination Protocol Info
    40 4.736673 76.212.103.xx 64.50.120.xx SIP Request: NOTIFY sip:64.50.120.xx

    Frame 40 (371 bytes on wire, 371 bytes captured)
    Arrival Time: Jun 18, 2008 13:45:43.422414000
    [Time delta from previous captured frame: 0.111320000 seconds]
    [Time delta from previous displayed frame: 0.111320000 seconds]
    [Time since reference or first frame: 4.736673000 seconds]
    Frame Number: 40
    Frame Length: 371 bytes
    Capture Length: 371 bytes
    [Frame is marked: True]
    [Protocols in frame: eth:ip:udp:sip]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
    Ethernet II, Src: Cisco_3d:6b:da (00:0c:86:3d:6b:da), Dst: Dell_f6:db:64 (00:18:8b:f6:db:64)
    Destination: Dell_f6:db:64 (00:18:8b:f6:db:64)
    Source: Cisco_3d:6b:da (00:0c:86:3d:6b:da)
    Type: IP (0x0800)
    Internet Protocol, Src: 76.212.103.71 (76.212.103.71), Dst: 64.50.120.38 (64.50.120.38)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 357
    Identification: 0x1528 (5416)
    Flags: 0x00
    Fragment offset: 0
    Time to live: 235
    Protocol: UDP (0x11)
    Header checksum: 0x4cec [correct]
    Source: 76.212.103.xx (76.212.103.xx)
    Destination: 64.50.120.xx (64.50.120.xx)
    User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
    Source port: sip (5060)
    Destination port: sip (5060)
    Length: 337
    Checksum: 0x331f [correct]
    [Good Checksum: True]
    [Bad Checksum: False]
    Session Initiation Protocol
    Request-Line: NOTIFY sip:64.50.120.xx SIP/2.0
    Method: NOTIFY
    [Resent Packet: False]
    Message Header
    Via: SIP/2.0/UDP 192.168.1.100:5060;branch=z9hG4bK-8064dec0
    Transport: UDP
    Sent-by Address: 192.168.1.100
    Sent-by port: 5060
    Branch: z9hG4bK-8064dec0
    From: "408" <sip:408@64.50.120.xx>;tag=a5ece676b0eeb13o0
    SIP Display info: "408"
    SIP from address: sip:408@64.50.120.xx
    SIP tag: a5ece676b0eeb13o0
    To: <sip:64.50.120.xx>
    SIP to address: sip:64.50.120.xx
    Call-ID: c6759d77-e887e743@192.168.1.100
    CSeq: 4055 NOTIFY
    Sequence Number: 4055
    Method: NOTIFY
    Max-Forwards: 70
    Event: keep-alive
    User-Agent: Linksys/SPA922-5.2.5
    Content-Length: 0

    This is the Method Not Supported Return Packet. Occurs whenever I pick up the phone when she calls
    No. Time Source Destination Protocol Info
    42 4.843422 64.50.120.xx 76.212.103.xx SIP Status: 405 Method Not Allowed

    Frame 42 (384 bytes on wire, 384 bytes captured)
    Arrival Time: Jun 18, 2008 13:45:43.529163000
    [Time delta from previous captured frame: 0.000343000 seconds]
    [Time delta from previous displayed frame: 0.000343000 seconds]
    [Time since reference or first frame: 4.843422000 seconds]
    Frame Number: 42
    Frame Length: 384 bytes
    Capture Length: 384 bytes
    [Frame is marked: True]
    [Protocols in frame: eth:ip:udp:sip]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
    Ethernet II, Src: Dell_f6:db:64 (00:18:8b:f6:db:64), Dst: Cisco_3d:6b:da (00:0c:86:3d:6b:da)
    Destination: Cisco_3d:6b:da (00:0c:86:3d:6b:da)
    Source: Dell_f6:db:64 (00:18:8b:f6:db:64)
    Type: IP (0x0800)
    Internet Protocol, Src: 64.50.120.xx (64.50.120.xx), Dst: 76.212.103.xx (76.212.103.xx)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 370
    Identification: 0x4c64 (19556)
    Flags: 0x00
    Fragment offset: 0
    Time to live: 128
    Protocol: UDP (0x11)
    Header checksum: 0x80a3 [correct]
    Source: 64.50.120.x (64.50.120.xx)
    Destination: 76.212.103.xx (76.212.103.xx)
    User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
    Source port: sip (5060)
    Destination port: sip (5060)
    Length: 350
    Checksum: 0x7e1a [correct]
    [Good Checksum: True]
    [Bad Checksum: False]
    Session Initiation Protocol
    Status-Line: SIP/2.0 405 Method Not Allowed
    Status-Code: 405
    [Resent Packet: False]
    Message Header
    Via: SIP/2.0/UDP 192.168.1.100:5060;branch=z9hG4bK-8064dec0;received=76.212.103.xx;rport=5060
    Transport: UDP
    Sent-by Address: 192.168.1.100
    Sent-by port: 5060
    Branch: z9hG4bK-8064dec0
    Received: 76.212.103.xx
    RPort: 5060
    To: <sip:64.50.120.xx>;tag=8e23414b
    SIP to address: sip:64.50.120.xx
    SIP tag: 8e23414b
    From: "408"<sip:408@64.50.120.xx>;tag=a5ece676b0eeb13o0
    SIP Display info: "408"
    SIP from address: sip:408@64.50.120.xx
    SIP tag: a5ece676b0eeb13o0
    Call-ID: c6759d77-e887e743@192.168.1.100
    CSeq: 4055 NOTIFY
    Sequence Number: 4055
    Method: NOTIFY
    User-Agent: 3CXPhoneSystem 5.1.4510.0
    Content-Length: 0
     
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