Ive never came across a SBC and Im hoping to get some advice on understanding them and where to put them in the network.
We are currently using Asterisk as our PBX system and hoping to use a SIP trunk service by our MPLS provider. This SIP gateway will be within our MPLS VPN so it will contain a private IP address we can route to. Weve been informed we must use a SBC to connect to the SIP gateway.
This is the first Ive heard of a SBC. Cant Asterisk do the same functions as a SBC with registering and managing the calls? And where would you implement this sort of equipment in a collapsed core network that has two HA firewalls facing the outside of our network towards the PE router?
Session Border Controllers — TOP 10 FAQ
Interviews for Top Jobs at SBC
General Manager Interview
Application
I applied in-person. The process took 2 weeks. I interviewed at SBC in Jun 2011
Interview
Behavioral, multiple rounds, meeting the key people in organization. You need to know people. I knew them before and that helped me big time. 45 mins 2 sessions with HR and Management. You need to travel to their work place. The decision get right way, which is huge plus interm of how it saves your time. You need to negotiate on salary as management is budget sensitive
Interview Questions
Why should we hire you? What are you key skills?
ESL Teacher Interview
Application
I applied online. I interviewed at SBC
Interview
easy – they ask few questions from your CV to make sure you are native or not. They are quick so it isn’t lengthy. I was asked about my future goals, my salary expectations and if I have taught before. It was not that long or difficult.
Interview Questions
Have you worked before at a university setting?
Administrative Assistant Interview
Application
I applied through an employee referral. I interviewed at SBC (Atlanta, GA)
Interview
I was recommended by an employee, received a phone interview, and was hired at the end of the interview. The hiring manager already knew me, my capabilities, and work ethic prior to the interview.
Interview Questions
What has led you to make a change in employment?
A Session Border Controller (SBC) is a network element that provides security and connectivity services for VoIP networks. It sits at the edge of the network and controls the signaling and media streams for each call. SBCs can provide a number of features such as NAT traversal, call admission control, media gateway control, and echo cancellation.
If multiple people try to access the same phone number at the same time, the Session Border Controller (SBC) will route the calls to the appropriate places. For example, if two people are trying to call the same person, the SBC will route one call to voicemail and the other call through to the person.
SBCs and firewalls are both types of security devices that are used to protect networks. However, they differ in terms of functionality. SBCs are designed specifically for VoIP traffic and provide features such as call routing, NAT traversal, and media gateway control. Firewalls, on the other hand, are more general purpose and can be used for a variety of different types of traffic.
Session Border Controllers (SBCs) are devices that manage VoIP calls and traffic. They are an important part of any VoIP network and are used to ensure quality of service (QoS) for VoIP calls. When interviewing for a position that involves working with SBCs, it is important to be prepared to answer questions about your experience and knowledge. In this article, we review some of the most common SBC interview questions and provide tips on how to answer them.
SBCs are used to provide a number of security and performance benefits for VoIP networks. By inspecting and filtering all traffic passing through the SBC, it can help to prevent denial of service attacks and other types of malicious activity. SBCs can also help to improve call quality by managing traffic congestion and providing other quality of service features.
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Over the last 12 months we’ve shared a lot of information about session border controllers, applications for SBCs, customer use cases, along with details on FreeSBC installation and configuration. During that time, also been asked dozens of questions and done our best to answer every single one of them live during the event or in writing on the TelcoBridges forum. With this milestone, we thought it was time to look back at the most popular and frequent questions. So join us as we review our “Top 10” FAQ. A recording of the webinar can be found at: https://www2.telcobridges.com/FreeSBCVideoLibrary Learn more at: www.freesbc.com
Over the last 12 months we’ve shared a lot of information about session border controllers, applications for SBCs, customer use cases, along with details on FreeSBC installation and configuration. During that time, also been asked dozens of questions and done our best to answer every single one of them live during the event or in writing on the TelcoBridges forum. With this milestone, we thought it was time to look back at the most popular and frequent questions. So join us as we review our “Top 10” FAQ. A recording of the webinar can be found at: https://www2.telcobridges.com/FreeSBCVideoLibrary Learn more at: www.freesbc.com
Slideshows for you (1
1. SBC – Top 10 FAQ We answer your most frequently asked Session Border Controller questions January 2019 2
2. 3 Past Webinars http://www2.telcobridges.com/FreeSBCVideoLibrary
3. 4 Frequently Asked Questions 1. Whats difference between an SBC and a SIP Proxy? 2. How does an SBC detect and defend against DOS/DDOS attacks? 3. Can an SBC help stop Robocallers? 4. How do SBCs limit call traffic? 5. What is topology hiding? Why do you need it? 6. Can I use an SBC to perform load balancing? 7. Do SBCs facilitate billing? 8. Does FreeSBC work with ________ ? 9. What are the risks/rewards for putting SBCs in the cloud? 10. Is FreeSBC really Free? When is it not free?
4. 5 Today’s Presenters: Alan D Percy Senior Director of Product Marketing [email protected] Marc St-Onge Director of Sales Support [email protected]
5. 6 The SIP School
6. Whats difference between an SBC and a SIP Proxy? 7
7. 8 SIP Proxy/Server Architecture Header ManipulationRouting Engine Media SIP Session s Public WAN 34.0.0. 1 SIP Proxy/Server SIP Application s 34.0.0.X
8. Routing Engine Media Media Engine SIP Session s B2BUA UAS UAC Private LAN 192.168.0.X Public WAN 34.0.0.1 Session Border Controller SIP Applicatio ns Session Border Controller Architecture
10. How does an SBC detect and defend against DOS/DDOS attacks? 11
11. DOS/DDOS Attacks Network Border Internet SBC Application DOS/DDOS and Registration Floods
12. 13 Protecting against DOS/DDOS • Built-in Firewall with Access Control Lists (ACL) • Dynamic Firewall Management • Blacklists – IP addresses/ports of known offenders • Whitelists – known valid users • Bandwidth Management • Call Rate Limiting • CPS limits, deflecting bad traffic • Line Rate Speed Processing – Important
13. Can an SBC help stop Robocallers? 14
14. SHAKEN: Verify valid calling numbers 15 Robocaller Terminating TSP Call with fake caller ID Happy customers Authenticate caller ID and sign call Verify signature and apply policies Complete with warning Block Phone Captcha Divert Originating Telecom Service Provider Policy choices
15. Originating service provider authenticates 16 Session Border Controller Originating Telecom Service Provider Authentication Service (AS) Secure Key Store (SKS) Calling Party 1. Call originates 2. SBC sends SIP INVITE to AS 3. AS checks caller ID, and returns signed SIP Identity header. 4. Sends call Outbound Call
16. Terminating service provider verifies 17 Session Border Controller Terminating Telecom Service Provider Verification Service (VS) Certificate Repository (CR) Inbound Call 1. Call arrives 2. Call Control initiates terminating trigger, sends to VS. 3. VS looks up CR URL, fetches certificate and extracts public key to verify the signature. Uses verification and token info to select policy and return the call to Call Control. 4. Call terminates Called Party
19. 20 Call Rate Limiting Intelligent “Speed Limiter” managing the incoming call flow • Maximum # Calls • Max Calls Per Second (CPS) • Inbound and Outbound • Handling Excess Traffic: • “Congestion” – Slowing responses • “Network Limit” – Configured per network • “Hard Limit” – Reject any new requests
20. What is topology hiding? Why do you need it? 21
21. 22 Topology Hiding Not exposing the internal network configuration or IP addresses to the outside world Only the SBC is visible to the outside world Substitutes IP addresses in SIP headers and on RTP
22. Can I use an SBC to perform load balancing? 23
23. 24 Load Balancing Distributing call traffic based on: • Priority • Availability • Round-robin • Dialed or Calling # • Table/Script bases • And more… Routing Engine
24. Do SBCs facilitate billing? 25
25. 26 Billing Systems and SBCs SBC Subscribers Call Servers Billing System $$$Text CDR or RADIUS
26. Does FreeSBC work with ________ ? 27
27. Interoperability
28. What are the risks/rewards for putting SBCs in the cloud? 29
29. 30 SBC Deployment Models Compared Appliance (Bare Metal) Virtualized Cloud Highest Performance Most predictable Small CPE appliances Dedicated hardware Best for large scale and private datacenter 1+1 Redundancy Flexible deployment options “Service Chain” VM overhead limits performance and predictability “Pay as you grow” CAUTION: Media charges and throughput caps “Noisy Neighbors?” Good for dynamic requirements and flexible deployments
30. Is FreeSBC really Free? When is it not free? 31
31. 32 FreeSBC Editions Feature/Capability FreeSBC FreeSBC PRO Back to Back User Agent (B2BUA) DDOS / DOS Protection NAT Traversal SIP Header / Digit Manipulation Call Routing Call Rate / Bandwidth Limiting Access to Wiki and Community Support Live Support and Software Update Service High Availability 1+1 90-day Trial Media Bypass (RTP no anchoring) 90-day Trial TB analytics 90-day Trial OSS/BSS, RADIUS, SNMP & API Connectors 90-day Trial For a full comparison, see: www.freesbc.com/pricing
32. 33 Learn more at: www.FreeSBC.com
33. 34 Learn More…
34. 35 Q&A The SIP School www.thesipschool.com Free copy of SBC software: www.freesbc.com Other Recorded webinars at: freesbc.com/video-library Q/A?
Welcome to “FreeSBC – A New Approach to the SBC”, a webinar event hosted by TelcoBridges Before we begin, a little housekeeping: As a live event participant, you’ll have the opportunity to interact with today’s speakers and hope you do pose your questions and comments on today’s topic using the Q/A panel. To pose a question or comment, open the Q/A panel by clicking on the box in the upper left of your screen. We’ll cover your questions toward the end of the session. We’ve found that some attendees may need to adjust the webinar View Options to see the full slide on your screen. If you are not seeing a full slide, move your mouse to the top of the webinar window and a View Option selection will appear – choose an option that best fits your screen. Also, today’s event is being recorded and all those that have registered will received a link to the recording for on-demand playback. We hope you share the link with your co-workers and others that would find the discussion valuable.
Some introductions to get started: I’m Alan Percy, Senior Director of Product Marketing for TelcoBridges and today’s event moderator. Having joined the company in December, I’m the “new kid on the block” and responsible for driving awareness of the session border controller solutions from TelcoBridges. Joining us today is Marc Saint-Onge, Director of Sales Support for TelcoBridges. Marc has a long history with TelcoBridges, providing technical expertise and advice to customers across the globe. Marc, thanks for being a part of today’s event. [Marc response] And we’re glad to have you, our attendees, with us today and encourage you to use the opportunity to interact with our speakers by posing your questions and comments.
Recognizing these needs, TelcoBridges offers FreeSBC, a software SBC solution designed specifically for cloud and virtualized deployments. Highly scalable with carrier-grade reliability, FreeSBC is a commercial SBC, offered under a “freemium” business model. We feel FreeSBC better fits the emerging cloud application market needs for affordable voice network security.
FAQ
How does a session border controller work?
Session border controllers are designed to control communication that navigates through service provider networks, as well as handling all the signalling and media functions required to make SIP work seamlessly. SBCs enforce the Quality of Service (QoS) for conversations, as well as maintaining security.
Do you know what a session border controller is?
A session border controller (SBC) is a dedicated hardware device or software application that governs the manner in which phone calls are initiated, conducted and terminated on a voice over Internet Protocol (VoIP) network. Phone calls are referred to as sessions.
Why do I need a session border controller?
SBCs mitigate threats and protect the network from DoS attacks. DoS attacks are sometimes accompanied by malware, thus when an SBC mitigates a DoS attack it also ensures critical protection from dangerous malware. Once an SBC spots a potential threat, it can quickly block the problem.
What is a session border controller SIP?
A session border controller (SBC) is a network element deployed to protect SIP based voice over Internet Protocol (VoIP) networks. Early deployments of SBCs were focused on the borders between two service provider networks in a peering environment.
