[SIPForum-discussion] =?gb2312?B?UmU6ICjI8NDHzOHKvi20y9PKvP6/ycTcysfArLv408q8/ilSZTogW1NJUEZvcnVtLWRpc2N1c3Npb25dIFJGQyAyODMzIFJUUCBFdmVudA==?=

[wellya]

capture packet in ethereal ,pls point interface 





wellya
2007-06-22



·¢¼þÈË£º amit
·¢ËÍʱ¼ä£º 2007-06-22 13:53:24
ÊÕ¼þÈË£º Pradeep J
³­ËÍ£º discussion at sipforum.org
Ö÷Ì⣺ (ÈðÐÇÌáʾ-´ËÓʼþ¿ÉÄÜÊÇÀ¬»øÓʼþ)Re: [SIPForum-discussion] RFC 2833 RTP Event

Hi pradeep,

i m already have ethereal.
ethereal shows the rtp event packets
but i m not able to capture these packets via JMF Or any other program.

you have any solution regarding this.



Thank you in advance.
     
       Amit  









On Fri, 2007-06-22 at 01:18 -0400, Pradeep J wrote:

Hi,
You can capture the RTP packets by taking the ethereal trace ..
The ethereal tool can be downloaded from www.winshark.com

Cheers,
Pradeep

On 6/20/07, amit <amit.v at pyronetworks.com> wrote:

Hi Onur,

you are right easy to decode the digit from the incoming RTP  packets. But i am not able to capture these RTP packets.

How I can capture these Packets Help me

Thank you in advance.
     
       Amit  



On Wed, 2007-06-20 at 13:21 +0300, Onur Cinar wrote:


Hi Amit,

Actually if you take a look at the RFC 2833 you should be able to easily decode the digit from the incoming packets. The payload is 32 bits:

8 bits  for event
1 bit  E flag
1 bit  R flag
6 bits volume
16 bits duration (in ms)

The first 8 bits hold the digit that you are looking for. Take a look at section 3.10 for the values.

Although you are only interested in the digits, take E flag in to account as well in order to make sure that you won't count the same digit more than one time. 

Regards,

-onur





---
Visit Nuvoiz.com for our SoftPhone Solutions!
A. Onur Cinar - Istanbul Office Manager
www.nuvoiz.com




On 6/20/07, amit <amit.v at pyronetworks.com> wrote:




Hi All,

I would like to read the specific DTMF digit from the received RTP Event. At the moment I detect that there are DTMF tones (RemotePayloadChangeEvent -> Payload 101), but I have no idea to receive the "RFC 2833 RTP Event", that I see in my Ethereal Capture. If I have this Event I think I can extract the Event ID... 

I would be pleased to see some ideas or helpfull code fragments how to receive this RFC 2833 RTP Event.

Thank you in advance.
Amit 


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-- 
Cheers,
Pradeep

Expect the UnExpected !!! 
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