Sara, We don't seem to communicate at the same frequency. I have nothing else to say. Good luck.
On Wed, Jun 25, 2014 at 11:06 AM, Sara Chérif <saracheri...@gmail.com> wrote: > Thanks Activecat very much . > > Now, SIP packets length is varying & RTP packets have fixed length of 87 > bytes . Now to input this traffic coming from the soft phone to the > Gnuradio to be processed, i use the UDP source block(to read the UDP > packets from the soft phone port) > in UDP source block , I can determine only one port number and Ip > address. I put the IP address of the Wlan interface (my laptop IP address) > , i also tried to put "0.0.0.0" and the port number of twinkle soft phone > on which i receive the RTP traffic. > > I faced some problems: > > First ,How to receive now the SIP signaling packets and the Rtp packets at > the same time to establish a call with another soft phone ( as the soft > phone uses 2 different port numbers for sip & RTP while i have to identify > only one port number in the UDP source block)?? > The flow graph i use consists of :Udp source - throttle -Uchar to float > and WX GUI sink scope. > I tried to duplicate the flow graph (to use another one which is the same > as above and runs in parallel ) > Also I tried to use 2 UDP source block then the add block. > But I don't know till now how to multiplexes the two traffics (SIP and > RTP) as we need to integrate the whole system to see this & what is the > right method ? DO I have to write simply the port of the ethernet > connection ? > What will I do in this case : If I want to make the call between the 1st > & 2nd lap ( One has Twinkle & the other has GNU Radio & Twinkle, and I > want GNU Radio to capture packets coming to Twinkle ? (use 2 udp source + > add block ) ? > > Second, i don't know how to determine the payload size. what if the packet > length in the case of the Sip signaling is variant. In the soft phone, we > can determine the maximum transfer unit (MTU), does this help here ? > > Third, i have a question relating to the OFDM transmitter: what is the > required packet length , I wrote it 100 as each sip packet is 87 bytes and > I will use coding with rate 7/8 then after coding each packet is 100 bytes) > what if the packet length is variable as in the case i stated above (SIP > pkt length is not constant)? > > Note: i want to capture the packets coming from the soft phone in order to > process them on gnuradio using OFDM system and send and receive them at the > other end using two Usrps to be used as input to the other soft phone. > > Thanks in advance > >
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