Ubuntu Networking :: Capture Voip Data For Skype?
Dec 9, 2010
I'm using tcpdump and tcptrace to track all incoming and outgoing data packets through my network interfaces. But I fail to monitor the voip data for skype that way, although it works well with http port 80, for example.
I want to track the ip address of the data packets for skype, i.e. know the ip address of the other one speaking at the other end of skype. How can I achieve this?
I've checked the port setting in my skype and I'm sure I'm listening on the right port. But nothing is showing up while I'm in connection with skype.
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May 2, 2011
Is there another SIPS/VoIP program that can be used to speak to someone on Skype?
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Jan 27, 2010
I was just wondering if you know of any site/forum that is informative about Asterisk. I have just configured an Atcom IP04 in which Asterisk is embedded. I need to know how to configure the IP-PABX to receive fax and come up with a Skype Gateway to receive/call out on Skype.
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Aug 15, 2010
Does anyone notice a degradation in sound quality with skype and pulseaudio? It seems that when I use pulseaudio there are bugs in the sound quality in skype. I also notice a lag when talking to someone with the VoIP feature.
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May 4, 2010
I need to use Skype to contact my kids in South Africa. I live in the UK. This is very important for me. Surely there must be a fix by now on 64bit 10.04 to use mic capture or a workaround.
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Feb 3, 2010
I've set up a transparrent squid box with two nics. Eth1 = Internet eth0= LAN +Dchp my question is, can I log the data usage of a skype call. My proxy server already records all http an https requests but doesn't record some programs like skype. I know that it is not http traffic, but can I tell my system to record data use by an ip address over a nic with the help of iptables for example?
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Mar 22, 2010
I just upgrade to F12 from F10 and having problem with Skype mic audio. it was working well with F10 before.
I have try to plug in a mic for internal sound card and using external USB headse, both sources could not capture my mic audio. I try to use Gnome Volume preference to select the source and it makes no different. I also noticed the output volume is low on USB headset too
Just get it working on playing with Gnome Volume preference. I find that on headset input and output audio, I have to crank it up to 100% range to get it working. Volume control seems to be useful from 80-100% Problem solved, hope pulseaudio would improve the volume control
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Jun 8, 2010
i have sound but my mic capture seems to be not working in skype or well anything else and I'm confused on what to do after searching. It's an integrated mic somewhere in my laptop. I enabled capture in Kmix but that didn't seem to do anything.
[Code]....
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Apr 21, 2010
I basically want to record audio streams. The most useful purpose is to record conversations on skype (and other applications). This is for a legitimate reason if anyone is worried; I often have long conference calls on skype (an another voip collaborative tool called EVO), and a recording would be a nice way to keep minutes and participate in the working meeting. I'm not worried about capturing video yet. The audio is the important for me for now. This is going to display my woeful ignorance of Linux audio systems. I'm running F12 x86_64 on a Dell inspiron laptop. I believe that the system is using the PulseAudio sound server.
I thought something like:
ffmpeg -f oss -i /dev/dsp sample.mp3
Could work, but I don't have a /dev/dsp. I think these are in a separate directory /dev/snd; however the content of this directory is not clear which device is the appropriate one. I tried pointing ffmpeg to a few of them, but it resulted in errors thus:
/dev/snd/hwC0D0: no such file or directory
I know it's there because [tab] complete. I found another alternative which uses parec.
parec --format=s16le --rate=44100 -channels=2 sample.raw
Unfortunately this only records the microphone input and not everything else going through my sound server. I wish I could find the link again, but there was a third alternative which required writing a bit of C code. I thought that could be a nice little project to better acquaint myself with this stuff.
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Feb 9, 2010
I have a toshiba phone system that has a feature where it spits raw data and i can direct that data to a serial port on the toshiba phone system or to an IP/PORT the data is just ascii data - tells me calls that are made/time/etc
I would like to setup an existing linux box to capture this data and store the data for me
then later i can build reports based on that data (and for me a report could be just a few cat's/greps/etc so basic stuff) - but i can figure this out later.
for now i would just like to GRAB the data on a port and dump it into a file (and recycle files every 24 hours)
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Feb 3, 2010
I have a spreadsheet which I update regularly. This involves downloading CSV files from a couple of websites, copying data from those files into an OO.org spreadsheet and copying formulas within the spreadsheet (the number of rows of data varies, so when the number of rows of data increases, I need to copy more lines of formulas).
I'd like to automate this process, so that with a single command I can get the data from the websites and feed it into my spreadsheet without having to copy rows of formulas. Although I've done lots of numerically-oriented programming, I have no idea how to undertake this automation task. I don't even know which tools I need to learn to do it.
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Jul 19, 2010
When I talk to anybody on Skype, the sound is really slow, it sounds like I am a robot. Its running at maybe 1/2 normal speed. I am using Xine backend and internal microphone.
[Code]....
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Jun 12, 2009
My home networking consists of a slackware box, running iptables with a dual NIC. That's the firewall. I have a Netgear FSM 7352S, which is a level 3 switch, which I am currently just using as a switch. Clients are numerous PCs and a couple of networked printers.
The "firewall" machine is also a file server.
Here are the issues I could use some pointers on:
I'd like to assure that the VOIP adapters get priority, assuring QOS, particularly voice quality.
I'd like to provide reasonable priority for video streaming, such as hulu and other sources, that the kids use.
I'd like bulk data transfers (like backing up partitions) to the file server that runs iptables, and acts as the firewall/gateway for a cable internet connection. It would be good to be able to do this without impacting VOIP and video streaming.
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Jul 17, 2011
I have a complex network. ADSL broadband comes into the house and connects to an Orange Livebox. An Ethernet cable then connects the Livebox to a more powerful router, a DrayTek Vigor 2710Vn. The reason for this is that the Livebox has a second line capability using Voip, but it is not powerful enough to get around my stone house. The DrayTek router has Voip capability, but as yet Orange will not connect the Voip line to it. I connect to this system with Ubuntu. Android, Windows and I-phone. I can connect to either of the routers, though I usually use the DrayTek.
Voip on the Livebox does not require a computer to run it, you just plug a normal phone into it and use it to get free calls. I actually take this line into a Panasonic telephone switch to give me a 2 line system around the house. The problem with this set-up is that after a short time something happens to the network which prevents Ubuntu computers connecting to it. Windows machines, I-phones and Android phones connect, but Ubuntu does not. If I re-boot the Livebox, or in an extreme case take it back to it's factory settings, the Ubuntu machines can connect again, but it's only temporary.
The fact that fixing Livebox sorts the problem definitely points to Ubuntu being innocent, but at the moment I can't do without the Livebox. That means, for the moment, having to stay with Windows. If I post the output log after a failed connection attempt, all it would show is the connection timing out. Why is Ubuntu so sensitive to network problems that are not of it's making. Is there anything I can do about it other than changing my ISP. I am considering that, but other factors make that difficult.
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Jul 16, 2011
I just setup a linux machine that act as a gateway along with squid running in transparent mode. Now I have one asterisk server which is behind that gateway I mean on my local subnet which pass through my linux gateway. Voip server having 4mb up n 4 mb down limit. Clients having 512kbps and upload 2mb.
Linux gateway : controlling band width of each clients
Squid acl forNAT issue with voip sites
Now my question is regarding skype calling. Since skype uses port 80, does it mean that it passes its request via proxy or direct and for safe side I've changed skype incoming port to 443 which squid does not see it. How much and width does skype use for calling in that case. Some one told me that it using squid to pass its request which I don't agree.
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Apr 15, 2010
I was given a project of installing a new Jive VOIP PBX and will be migrating it from an older Avaya PBX. I need to perform in order to migrate the DID's and extensions and etc from the old system to the new? It is something that I have never done and have been ask to perform a miracle. I have never used JIVE VOIP PBX's and am familiar with Trixbox stuff but for smaller business and nothing of this size.
[URL]
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Nov 8, 2010
I have Ubuntu 10.10 server gateway:
Code:
_______________________________
| ISP1 |<---->|ADSL modem, internal IP 192.168.1.1 |<------->|eth0 IP 192.168.1.10 |
|ubuntu server |
| ISP2 |<--------------------------------------------------->|wimax0,
[code]....
My goal is LAN must use ISP 2 to go to Internet and VOiP server must use ISP1. So, I write some iptables rules:
Code:
#!/bin/sh
#
IPT="/sbin/iptables"
# Internet Interface
[code]....
But there is problem: packets from DMZ network are not natting or may be something else wrong.Also my routing table:
Code:
# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 199 0 0 eth0
[code]....
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Jan 27, 2010
I'm trying to setup QoS for my VoIP line on my debian router box. I have tested wondershaper and to me it doesn't seem to work at all, so I'm looking for a better solution. Ultimately I would like something in the lines of [URL] but I guess such nice things doesn't exist for linux. Currently I'm on an ADSL link switching to cable in a few months.
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Aug 2, 2011
I am complete new to the technical side of VOIP. I know above diagram is not technically correct. I want a setup that works like that and oh the cheaper yet not compromising the better, even ekiga or skype can do that.
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Jun 5, 2010
I have two asterisk servers each one behind a linux firewall/gw. Linux is Centos 5.4, kernel 2.6.18-164.el5, iptables v1.3.5. Routes on the fws are ok and when iptables is stoped the servers are see each other, all good. But when I run iptables script in any fw, one server (not always the same) goes unreachable. I verify this with asterisk -r, then show sip trunk, and status becomes UNREACHABLE.
Iptables scripts is generated by fwbuilder. The weird part is I put only one rule to de script and it looks like Source=any, Destination=any, Service=any, Interface=any, Direction (Inbound,Outbound)=any, Time=Any, Action=ACCEPT. So as you can see I tried something like "Do not do anything at all". But anyway I run the script in any fw and one server becomes UNREACHABLE. I think the script does something wrong after all or maybe I have some missconfiguration in my asterisk conf files. The point is I am not so expert in iptables or shell scripting so I can't see anything in the iptables script. I have look for some issues like iptables blocking because of ip_conntrack table full, or "dont fragment" bit set in kernel problem, but nothing seems to be the right problem at all.
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Nov 7, 2009
I have recently bought a IP/PABX system with one FXO and one FXS port. I intend to install this on a remote site with a public but dynamic IP (can be resolved via dyndns though) and make calls via clients that are NATTed (inside a home router). I would like to seek advice on the port opening and the recommended settings. I have been reading a lot on VOIP and I am getting feedback that SIP calls are difficult to establish on a NATTed environment.
1.) SIP port 5060 UDP?
2.) RTP ports - what range should I open for this? I see some use 10000-20000 UDP
3.) STUN server - Is this something that needs to be configured?
How can I ensure that the other party can hear the audio just like a regular telephone? Is it really impossible to do if the client is behind a router in which it is using a Private IP Address? What other network configurations needs to be done?
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Aug 13, 2010
What is the best analogue capture program please to capture Austar.
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Feb 10, 2011
I`m using Fedora 14 and i`ve one problem, i use x-lite phone on windows and what is x-lite alternative for linux ? i`ve found x-lite phone for linux but it dont work fine . It has problems with sound card etc. What do you recommend?
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Mar 5, 2010
I have an application where I am sending data via serial port from PC1 (Java App) and reading that data in PC2 (C++ App). The problem that I am facing is that my PC2 (C++ App) is not able to read complete data sent by PC1 i.e. from my PC1 I am sending 190 bytes but PC2 is able to read close to 140 bytes though I am trying to read in a loop.Below is code snippet of my C++ AppOpen the connection to serial port
Code:
serialfd = open( serialPortName.c_str(), O_RDWR | O_NOCTTY | O_NDELAY);
if (serialfd == -1)
[code]...
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May 29, 2010
Does ubuntu have anything similar to window's program Cain & Abel for wireless packet capture?
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Jun 11, 2009
I have a network like
Node A to Vlan Switch
Node B to Vlan Switch
Node C to Vlan Switch
Node B is set up to be a middle man between A and C.
All nodes have 1 NIC.
They are all linux boxes. Node B can ping Node C. When I try to ping Node C from Node A, the ping just hangs forever.
When I use Wireshark to sniff What's going on with Node B during a ping from Node A to Node C, I can see an ICMP request with src = Node A and dest = Node C. I'd like to know if that ICMP packet was received by B from A or if it is going out. If it's going out, that makes no sense since B knows how to send to C. If B is only getting the requests but not forwarding them, then I know there is something wrong with B's configuration.
So I'd like to be able to sniff incoming packets only, or outgoing packets only. Is there a way to do this?
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Jan 6, 2009
Got a Ubuntu system. Have a device on my LAN that can send Syslog messages.
I would like to:
1. Capture these specific syslog messages.
2. Keep them separate from any other syslog activity on the Ubuntu system.
3. View these syslog messages later.
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Apr 6, 2010
I would like to set up tcpdump to rotate log file every 1 hour and retain files for the lat 14 days but I don't think any combination of -C and -W would allow me to do that (Atleast I haven't been able to figure it out), so I am trying to rotate the files every X number of MB and retain the last 20 files. This seems to be fairly simple with the '-C X -W 20' option but I am having some trouble in customizing the names of the log files. I have tried '-w capture-$(date +%Y-%M-%d-%H:%M-)' thinking that each file would start with the current date and time but all files are using the date and time when the capture was started so the only difference is the number at the end (which is done by -W). if I can customize the names of the file so that it has the date and time when the capture in started. In fact if I can do that, I dont need the numbers that '-W' appends at the end but I dont know how to get rid of them.
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Jun 10, 2009
I am looking for a solution for our LAN traffic monitoring and would like to use some opensource linux application. I have a linux box with two NIC cards and what I thought is the following: Our setup is as follows. Internet comes in through the router and into the firewall. From the firewall it goes into our switch and distributed among the workstations.
I have no access to the router or the firewall as they are centrally configured. I would like to place a device into the loop through which I could monitor the LAN traffic.
Can I put a linux box between the firewall and the switch and have all packets going through registered and logged? I have a proxy server (non transparent) and that captures some but not all. I would like to get all packets registered without interfering with the LAN etc.
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Jul 3, 2011
I'm running ubuntu 11.04, and using firestarter for my firewall. Logging events, all good, but I'd like to be able to (tcp)dump the packets being dropped/rejected. Wireshark is great after the event, but can I hook iptables and tcpdump together somehow so the system logs the entire packet rather than the summary when it says "no"? I've had a quick look/google, but can't find anything. I'm sure somebody must have wanted to do this before - any pointers people?
PS - will keep looking and post the answer if I find one....
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