SIP Troubleshooting for Beginners - Outgoing Call Trace Review

This video is a breakdown of a wireshark trace that captured an outgoing call between a PBX and an ITSP (SIP Provider). It will be one part of a series of videos designed to give a better understanding of the SIP protocol.

[@penguin7776]

I start VOIP training in a couple of weeks. 8 hours all week. I have the criteria and want to get a jump on it. One was reading SIP Traces. This video was pretty easy to grasp. Thanks.

[@TerrellBoyer]

Thanks for the comment.

[@TerrellBoyer]

Where do you get voip training?

[@penguin7776]

I work at GTT. I do internet troubleshooting and recently acquired VOIP. We have a couple of VOIP engineers flying up from Dallas to train us. 8 hour for 5 days next week =fried brain.

[@TerrellBoyer]

+Rich Yanick Very Cool...

[@MarieColaco]

Thank you so much Terrell Boyer. You explain the SIP message in a very simple & precise way.

[@samuelsmith7548]

Going for a CO field position with Verizon... Thanks for the overview... Will help with my interview!

[@jakecormier3827]

Great instructions and explanations. Still applies today in 2019

[@ADJ161996]

Man, this is very helpful. Thank you very much for the informative SIP content

[@949surferdude]

Thank you very much. Out of all the SIP videos on KZbin yours was the most effective in explaining the SIP call flow. Can you do a video on building a SIP trunk. I don't understand the basics needed to build one (coming from a Avaya perspective)

[@ankitdhyani961]

Great video, Terrell. Detailed and to-the-point explanation.

[@rythmiccool]

Nice Video Terrell with a basic understanding of call flow.

[@cjamesmusic]

Very informational. I needed to brush up on basics for a voip tech job interview and this was one of the videos i watched. Thanks!

[@willbuck7952]

Outstanding job-sharing your knowledge is commendable. I salute you sir.

[@ECrespo175]

Great video, I would like to see more videos about deciphering each message (100,183,200) in detail.

[@TerrellBoyer]

Thanks Ed, I will work on that.

[@privera0933]

Nice video. It would be greater if you could do a video on how to troubleshoot Jitter issues. Keep them coming!

[@huyentruong1269]

t

[@williamburling3229]

I would appreciate your giving a presentation on how to set up wireshark or some other free app to enable us to see what you are seeing. Thank you for taking your valuable time to help us

[@ericblair9756]

Email me [e-mail] I've got ya

[@ralshwk]

Great video and explanation. Please make more. Thanks

[@brightorb1]

thanx so much for the amazing post , please please provide more simple to understand sip analysis

[@templedogs7847]

Terrell,, Thank you for making the videos and sharing what you have learned with those that are learning it...Such is the circle of life. Subscribed and looking forward to more from you.

[@vickneswaran8506]

Thank you - always help to clear up your understanding.

[@graham8377]

Thanks! Good video. I really liked that filter tip to see only the VoIP call.

[@michaelfrederickong7519]

Nicely done , I am just starting in this kind of job and you made so easier to understand.

[@rajendranalawade3239]

great post Terrel, it gives good understanding of call flow.

[@williamcastro4171]

Excellent video. Thank you for your time and dedication to share your knowledge!

[@hopefortruth]

Perfect! Thanks for sharing. I will be checking in for more videos!

[@pranabpadhi]

Thanks for sharing Terrell, keep up the good work.

[@ryanmcmillan763]

Thanks for the video, very simple and easy to follow.

[@flower789ash]

This video tutorial is awesome ,Please do a tutorial with SIP PRACK Call flow

[@ramrathods]

Great Video Terrell. Hats off!

[@TerrellBoyer]

Ram Rathod Thank you!

[@bshack0]

Thanks for the video! Greatly helped me understand call tracing at the SIP level.

[@oussverde]

thanks for sharing very helpful and clarifying

[@kingshuksinha3061]

Nice explanation. Hope to see more from you..Awesome

[@alltech247]

Hi Terrell THUMBS UP....This is great tutorial.

[@arizshakilkhan6039]

Thanks for making things easier!!

[@vindasad]

Wow, this is definitely the video I was looking for, really good explanation, Terrel I do not know how to express how grateful I am with this video, I hope you can make more videos such as this one... Thanks :) Subscribed!!!!

[@ankitmunhet4659]

thank you Terell you have given me a great information which i was looking for

[@musememedia3429]

This was a great video. Thanks for posting this stuff, its really valuable!!!

[@peyton05220]

Lots of information, this makes me learn!

[@TerrellBoyer]

Thanks Son!

[@lekepope]

Terrell, you the man!!!!Please keep it up

[@conradbennett6961]

Thanks bro for your work, its really a great intro to an SIP...

[@nestorguzman5018]

Great explanation! Thank you Terrell.

[@santoshr351]

Thanks for this video. This is very useful. Keep up the good work!!

[@jagan1991]

its really great... expecting many more ....

[@TerrellBoyer]

Jaga Priyan Thanks for the comment. Planning to make more SIP tutorials this week!

[@stevenfrazier7959]

Great job, thanks very much!

[@ccie8340]

Terrell, Excellent Video..Simple and to the point. Thanks for sharing this.

[@grmetechnologies3967]

Thanks for the video. Learnt a lot.

[@benice3117]

Can you please show how and where you setup the trace in relation to where your equipment and firewall is. If you could maybe throw in a diagram that would be great. I'm confused where you took the trace and what port was setup for mirroring and such.

[@masterofkings7887]

Hi Terrell, this is very helpful. I am supposed to demonstrate the same to my colleagues in a training session so that I can easily explain about encrypted SIP in Microsoft Lync calls. I searched for a completed SIP call capture file in wireshark site, but couldn't find one that is as good as this. I would be glad if you could share this capture file with me. Thank you.

[@wjoybrown]

Very helpful... thank you sharing your knowledge.

[@gesusdube]

Excellent video...you have explained things in much better simpler way than my teachers !!! I have a question to ask you-I have a site using SIP trunks. When I dial a 4 digit extension from a shared line, it gives my fast busy tone ONLY in SRST mode If I dial the same number from same phone in normal mode, all works well. My suspicion is Cisco Toll Fraud Prevention is blocking my calls...maybe,,,, For this, I have captured traffic using wireshark (when I unable to dial the number) but I don't know where in wireshark in will give an idea that it is indeed toll fraud prevention blocking calls!!!I ave been looking and looking. Any suggestions?

[@TerrellBoyer]

I would look for your specific call in the trace and look to see why it was rejected. If Cisco uses SIP protocol for their stations, you should at least see the call being initiated. Once you see that, follow the SIP flow to see what the rejection code was. It may not tell you specifically, but it may give you a better idea.

[@ajith_k]

Awesome, simple and very informative. Thanks for this :)

[@namle-br8ju]

Thank a bunch for sharing a great video

[@petermuia9519]

Hi Terrell. This is a good video. I was wondering like Crusty Tackleford,(who asked 10 months ago) how you setup your equipment to be able to capture these packets with Wireshark. Please shade light on this

[@zdye14]

Great tutorial!!! Thanks for sharing your knowledge ..

[@bigwizzle45]

easily digestible info. Thanks

[@jwebb1975]

This is a great video. Nice work.

[@magpieenterprise6781]

When would you take a packet capture and when to take call logs?

[@s.m.ehsanulamin7235]

For making an external call from my PBX to outside by means of sip trunk , i have experienced an problem. The calls are diconnected after one mins. The sip trunk were configured in SBC. I donot know what should i do? I checked the wireshark trace and found that the Release Message were coming from the Phone . Internal calls are woking fine. Will be glad to have your suggestion. Thanks in advance.

[@satheeshkumar-it7pz]

Excellent video, Thank Bro!!

[@ccntwc]

Awesome video! thank you.

[@godin7312]

Very good, informations important, is a help enough

[@kkupadhayay]

its really great terrell......

[@kodangbryan9662]

Great work pls i need help on SIP congestion

[@renjithknair7724]

hello sir what does it mean 401 Unauthorized and 500 Internal server error . SIP outgoing call not working after analyses the packet flow i received this

[@The-practice]

Hello, not sure if you still respond here. Just trying. I watched your outbound tutorial on SIP Troubleshooting for Beginners - Outgoing Call Trace Review. I am needing to understand how to set up traces to show the RTP stack. Currently I am unable to figure out how to incorporate the RTP/Audio information in my PCAPS. Any help on this would be appreciated. Thanks, Raheem

[@TomJerrysVlogs]

Well explained.

[@ernestoserrano946]

how would I answer this questions? You have observed the INVITE - 200 OK - ACK three-way handshake during the call setup. What messages are exchanged for tearing down a call session?

[@andyf424]

Great tutorials!

[@mozbius]

Can you do the same type of video for a call transfer?

[@cutesammie]

Great Video. Thanks a lot.

[@shaiz1985]

from where can i get the sip training in Riyadh Saudi Arabia, a physical taring as i am working in STC and can understand the system, traces, putty etc , please your feedback

[@mikemiller5051]

Great video!!

[@FahadullahMuhammad]

How did the call last for 14 seconds, when the start time is 10 and stop time is 14? Please explain.

[@romanislam1805]

Hi Terrell, Do you teach VoIP online ? or do you know any good training institute ?

[@PawanSharma-jn6um]

Can we convert syslogs to pcap file to view the call flow in wireshark?

[@elhabibbirouk9722]

Thank you!

[@Lordvishnus]

Thank you Terell..Do you have any real time examples for choppy audio, one way audio , audio gaps in SIP protocols..

[@Ayelmani]

Great video, very helpful. Thank you. How to capture whether DTMF is in band or out of band?

[@onyxsolo1]

Hi Ayman, It will be in the messaging and is determined during the call setup based on my understanding. All media gateways should detect DTMF tones, they let the PBX/CFS/Switch or whatever you're using know it detected tones and what the digits were so the PBX etc can determine if they have a feature associated with it or not (flashook/3way calling etc). If it doesn't those digits get passed over to the endpoint device of the sip trunk the call routed over; However, as I stated earlier whether the DTMF tones are passed inband or out-of-band is determined when the call is first setup based on my experience so you should see it in your standard sip messaging capture.

[@johanngonzalez9780]

Good Video !!! congrats

[@golus4963]

Seriously lovee it

[@logandrake4946]

thank you a lot that was so helpful

[@sebastianolvianboros2083]

Hello, @Terrell. Great Video btw. Is there any chance to receive RTP packages ( from freeshwitch) while outgoing / incoming calls only (no active session)

[@MrVenugopal2010]

Good one

[@thompsonlin7249]

thank you for the vedio

[@BrianThomas]

Great video Terrell. I'd love to setup an ADTRAN 908e in a lab in order to capture a pcap file with a good working test calls. Thanks to your video's I think I have handle on setting up for the tcpdump. I'm just not sure how to setup an ADTRAN 908e for a lab environment. Do you have any suggestions? I've contacted ATRAN, but no luck yet. The ADTRAN does have some great debug commands that I've used many times, but not as good as what you'll get in Wireshark.

[@TerrellBoyer]

What are you looking to setup?

[@BrianThomas]

Terrell Boyer I'm looking to setup a PRI lab using the 908e

[@TerrellBoyer]

Well, If I gain access to a 908e, I will keep that in mind for a future video.

[@Eskimoz]

Top !

[@stephaniem3149]

your voice is just like a chocolate's commercial :p

[@thebuckstopshere79]

great video - but i think the call length was around 4 sec - not 14

[@TerrellBoyer]

thebuckstopshere you are orrect. Good catch.

[@thebuckstopshere79]

Terrell Boyer Still an excellent video. Probably one of the best SIP call flow tutorials on the Web. Congrats

[@xiaomeng3943]

I could be more helpful with the topology diagram, which shows how everything is connected.

[@sultanfahad]

Very useful and helpful. Thanks!

[@joelourenco4621]

Thank you!