[fpc-pascal] Help Reading SIP Messages.

[ik]

use libpcap (and bind it to FPC and share with us all :)) and then you can
sniff packets (that's the easiest way I know).

Ido
http://ik.homelinux.org/


On Tue, Jan 5, 2010 at 16:48, lloyd thomas <lloydie.t at googlemail.com> wrote:

> Also came across this which uses pcap, but seems to be delphi only
> http://www.magsys.co.uk/delphi/magmonsock.asp
>
> is there something similar for fpc?
>
> 2010/1/5 lloyd thomas <lloydie.t at googlemail.com>
>
> OK. I wish to monitor and record calls between a SIP endpoint and SIP
>> Gateway. At the moment I am doing that by connecting the SIP endpoint and my
>> machine to an ethernet hub so that I can see all the traffic.
>> In the first instance I just need to correctly capture, read and
>> interprete the SIP messages so that I can make an informed decision which
>> RDP packets to capture.
>>
>> Then I suppose I will have an even harder task capturing the RDP packets
>> and joining both legs together (my coding skills is not great)!
>>
>> Lloydie T
>>
>> 2010/1/5 ik <idokan at gmail.com>
>>
>> Hello,
>>>
>>> SIP first of all uses UDP most of the times (and rarely TCP) .
>>> It only create a tunnel that other protocols such as RDP and SDP are
>>> going inside.
>>>
>>> Can you explain a bit more what exactly do you wish to implement (i'm not
>>> sure that I understand) ?
>>>
>>> Ido
>>>
>>> http://ik.homelinux.org/
>>>
>>>
>>> On Tue, Jan 5, 2010 at 15:08, lloyd thomas <lloydie.t at googlemail.com>wrote:
>>>
>>>> Please forgive my ignorance regarding the project I am about to embark
>>>> on.
>>>> Need some advice on Lnet and capturing SIP RTP data to file. In the
>>>> first instance I just need to work with the sip messages. I believe the SIP
>>>> messages are similar to HTTP. I am using wireshark to understand how the SIP
>>>> messages are processed, but I am not sure how to capture and read each frame
>>>> (wireshark speak) using Lnet.
>>>>
>>>> (FYI:
>>>> http://en.wikipedia.org/wiki/Session_Initiation_Protocol#SIP_network_elements
>>>> )
>>>>
>>>> For instance the following is from frame 12 (935 bytes)
>>>>
>>>> ----------------------------------------------------------------------------------------------
>>>> INVITE sip:1002 at 192.168.91.200 <sip%3A1002 at 192.168.91.200> SIP/2.0
>>>> Via:SIP/2.0/UDP 192.168.91.190:5060;rport;branch=z9hG4bK83570061
>>>> From:"Lloyd" <sip:1000 at 192.168.91.200 <sip%3A1000 at 192.168.91.200>
>>>> >;tag=4b428357-2fa-1ec5d4e
>>>> To:<sip:1002 at 192.168.91.200 <sip%3A1002 at 192.168.91.200>>
>>>> Contact:"Lloyd" <sip:1000 at 192.168.91.190:5060;transport=UDP>
>>>> Call-ID:83570000-4ce59f27 at 192.168.91.200<Call-ID%3A83570000-4ce59f27 at 192.168.91.200>
>>>> Subject:sip phone call
>>>> CSeq:2112045024 INVITE
>>>> User-Agent:Mitel-5212-SIP-Phone 07.02.00.04 08000F24BEE5
>>>> Allow:INVITE,ACK,CANCEL,BYE,OPTIONS,REFER,NOTIFY,PRACK,UPDATE
>>>> Allow-Events:talk,hold,conference
>>>> Supported:timer,100rel,replaces
>>>> Session-Expires: 1800
>>>> Min-SE: 90
>>>> Max-Forwards:70
>>>> Content-Type:application/sdp
>>>> Content-Length:247
>>>>
>>>> v=0
>>>> o=1000 1262650963 1262650962 IN IP4 192.168.91.190
>>>> s=SIP Call
>>>> c=IN IP4 192.168.91.190
>>>> t=0 0
>>>> a=sendrecv
>>>> m=audio 20036 RTP/AVP 0 8 18 96
>>>> a=rtpmap:0 PCMU/8000
>>>> a=rtpmap:8 PCMA/8000
>>>> a=rtpmap:18 G729/8000
>>>> a=rtpmap:96 telephone-event/8000
>>>>
>>>> -----------------------------------------------------------------------------------------------
>>>>
>>>> I get a response from the sip server on frame 13 (371 bytes)
>>>>
>>>> ----------------------------------------------------------------------------------------------
>>>> SIP/2.0 100 Trying
>>>> Via: SIP/2.0/UDP 192.168.91.190:5060;rport=5060;branch=z9hG4bK83570061
>>>> From: "Lloyd" <sip:1000 at 192.168.91.200 <sip%3A1000 at 192.168.91.200>
>>>> >;tag=4b428357-2fa-1ec5d4e
>>>> To: <sip:1002 at 192.168.91.200 <sip%3A1002 at 192.168.91.200>>
>>>> Call-ID: 83570000-4ce59f27 at 192.168.91.200
>>>> CSeq: 2112045024 INVITE
>>>> User-Agent: FreeSWITCH-mod_sofia/1.0.trunk-15355M
>>>> Content-Length: 0
>>>>
>>>> -----------------------------------------------------------------------------------------------
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> fpc-pascal maillist  -  fpc-pascal at lists.freepascal.org
>>>> http://lists.freepascal.org/mailman/listinfo/fpc-pascal
>>>>
>>>
>>>
>>> _______________________________________________
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>>>
>>
>>
>
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