NE#18 Session Border Controller (SBC) 101

[@NetworkEngineeringVideoBlog]

Here are the pre-screening questions from the recruiter. www.muxall.com/docs/SBC_Job_Description_PreScreenQs.doc

[@williamlennard_05]

Hey, this was a great video if possible can you post some more videos on the Oracle Acme Packet SBC?

[@NetworkEngineeringVideoBlog]

I would post more videos on it if I had one. My knowledge of the Acme Packet SBC is very dated, now. I'm sure it has changed a bunch since I worked on one.

[@josephpencille625]

ACK is there because after the 200OK/wSDP, it will send another ACK to say "BYE", = Nothing is preventing it to say "BYE" in the SDP. Very nice video!!

[@NetworkEngineeringVideoBlog]

Good comment. Since the this video is over a year old, I don't remember which part of the video you are commenting on without having to re-watch it. I agree that there is nothing in the SDP that prevents a SIP BYE.

[@backyardmech]

I am taking an Avaya SBC training course soon - thanks for this excellent tutorial !

[@949surferdude]

How was your training? Was this a company sponsored training?

[@SunilKumar-pq1bo]

How was your training?

[@backyardmech]

@@SunilKumar-pq1bo It was good Sunil . I don't like 'virtual' training ; but Avaya put on a very good online course !

[@backyardmech]

@@949surferdude It was good Surfer . I don't like 'virtual' training ; but Avaya put on a very good online course ! And yes - Bell Canada paid my tuition

[@SunilKumar-pq1bo]

Do you have any material that you can share please?

[@habsocrack2063]

UDP = User datagram protocol, has no sync/error correction. i.e. there's no resending of any missed packet --- Cheers.

[@NetworkEngineeringVideoBlog]

Hello OG, I agree: UDP is not like TCP with sync and resending of lost packets. Did I say differently in the video?

[@949surferdude]

Great video. Hope you create new content.

[@NetworkEngineeringVideoBlog]

I would create new SBC content if I had a SBC. I've looked on ebay, but the Acme Packet / Oracle SBC that I am familiar with are still too expensive to buy for making videos. I do plan on making more videos about the CUBE (Cisco Unified Border Element).

[@TheLievin]

Good video can you please post videos on Audiocode SBC..

[@ismailmouafy2754]

For multiple providers, I guess you need to use session group(42:00

[@NetworkEngineeringVideoBlog]

Yes, I misspelled border on the Title Page. I would fix it and upload another video but it is 11GB and took over 12 hours to upload.

[@949surferdude]

Thank you for posting this. I'm a Avaya engineer and badly want to get into a position working with SBC's.

[@psyconaut3232]

UDP, TCP & TLS transport protocols used.

[@NetworkEngineeringVideoBlog]

You don't use TCP (TLS is encrypted TCP) for transport, just signaling. TCP will add too much delay to the audio. It's better to just drop the packet rather than resend it.

[@psyconaut3232]

@@NetworkEngineeringVideoBlog Sorry, I meant in signalling not RTP streams.

[@bitwamet]

@@NetworkEngineeringVideoBlog Acme does support TCP and in companies we do use TCP for reliable signalling purpose in SIp-interface but mostly UDP

[@horizonbrave1533]

Awesome video...but one question... is an SBC ever used to accept or handle calls from a VoLTE call flow? Or does the SBC only handle and deal with calls that come in from WiFi/Internet? I notice that usually I see it handle devices that are connected to some "IP" cloud. So What about a cell phone that's using the 4G/5G Cellular network to place a call?

[@NetworkEngineeringVideoBlog]

Well, the 4G/5G/LTE traffic is usually turned into IP packets as soon as it hits the cell tower. Then, it is backhauled to your service provider’s (ATT, Verizon, etc) backbone network where it is processed and routed. I don’t see a need for an SBC between the cell tower and provider’s network unless they are owned by different entities. Then, maybe for topology hiding, an SBC might be used. Good question.

[@elazarOhayon]

thank you!!! very good explain

[@sid31ful]

Brilliant !!

[@Nazer50]

Thank you, great video.