Implementation of '501 Not Implemented'

[laurent.debacker at advalvas.be]

> Hi there,
>
> I have the following issue, when using MiniSIP with Asterisk.
>
> Asterisk sends, at regular intervals, SIP NOTIFY messages, for the purpose
> of notifying the user agent about messages in the user's mailbox.
>
> MiniSIP doesn't support the request, but doesn't answer anything. This
> means Asterisk considers the message as lost and start re-transmitting,
> which is useless and consumes resources.
>
> In theory, in these sorts of circumstances, the user agent is supposed to
> send back a "501 Not Implemented" type of response.
>
> Is there any chance to see this supported?
>
> Thanks in advance,
>
> Best regards,
>
> Laurent.
>

A copy of the NOTIFY message sent by Asterisk:

Session Initiation Protocol
    Request-Line: NOTIFY sip:814 at 192.39.226.5:5060;transport=UDP SIP/2.0
        Method: NOTIFY
        Resent Packet: True
        Suspected resend of frame: 20
    Message Header
        Via: SIP/2.0/UDP 192.39.226.98:5060;branch=z9hG4bK0fa3af81;rport
        From: "Unknown" <sip:Unknown at 192.39.226.98>;tag=as4845bf11
            SIP Display info: "Unknown"
            SIP from address: sip:Unknown at 192.39.226.98
            SIP tag: as4845bf11
        To: <sip:814 at 192.39.226.5:5060;transport=UDP>
            SIP to address: sip:814 at 192.39.226.5:5060
        Contact: <sip:Unknown at 192.39.226.98>
            Contact Binding: <sip:Unknown at 192.39.226.98>
                URI: <sip:Unknown at 192.39.226.98>
                    SIP contact address: sip:Unknown at 192.39.226.98
        Call-ID: 73a7bc2c4d0e8a50027486f80cf7dd1a at 192.39.226.98
        CSeq: 102 NOTIFY
        User-Agent: Asterisk PBX
        Max-Forwards: 70
        Event: message-summary
        Content-Type: application/simple-message-summary
        Content-Length: 93
    Message body
        Messages-Waiting: no\r\n
        Message-Account: sip:asterisk at 192.39.226.98\r\n
        Voice-Message: 0/0 (0/0)\r\n


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