Tutorial: What is a Softswitch?
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- Опубліковано 28 січ 2014
- Explains what a softswitch is by first undersanding what a CO switch is, with video of a visit to a REALLY BIG DMS-100 Central Office telephone switch, plus a discussion of the awesome call disposition filters you will be able to apply to your incoming communications in the future.
From CVA Course 2221 Fundamentals of Voice over IP
www.teracomtraining.com/onlin...
Designed for those needing to get up to speed on and understand Voice over IP technologies, buzzwords, jargon and mainstream solutions, and importantly, the ideas and fundamental concepts underlying VoIP, independent of any particular vendor's viewpoint. knowledge you can't get reading trade magazines or talking to salespeople.
Featuring detailed graphics, bullets, extensive text notes and our engaging and often humorous instructor Eric Coll, M.Eng., these training courses will give you the solid foundation you need to intelligently discuss, compare, evaluate and understand VoIP technologies, products and implementations.
We'll get started with a big-picture view of VoIP, identifying and explaining key components, jargon and buzzwords, standards and protocols. Then we'll review the many flavors of VoIP, comparing and contrasting implementation and architecture choices. Starting with Internet telephony and progressing through Managed IP Telephony, PBX replacement, Hosted PBXs, IP Centrex and Asterisk, you'll gain the knowledge you need to confidently differentiate VoIP architectures and discuss pros and cons of different implementation options.
"Softswitches" is a free sample of Lesson 4 of the course, explaining what a softswitch is by understanding what a "hard" switch is, visiting a DMS-100 Central Office telephone switch.
Course Outline
Jargon & Buzzwords • VoIP Phone System Components and Operation • Voice Packetization • LANs and WANs • VoIP Phones: MAC Address, DHCP, IP, UDP, RTP, QoS • SIP, Softswitches & SIP Trunking • Cloud • The Future
Fundamentals of Voice over IP is a complete introduction to everything Voice over IP. You'll learn the fundamental ideas and principles of a VoIP telephone system, VoIP, SIP & all the other jargon - what it actually means and how it all works together.
At each step, we'll also cover supporting and related technologies like Ethernet MAC frames and codecs and video over IP.
Course Lessons
1. The Big Picture
2. Terminals
3. Voice in Packets
4. SIP and Soft Switches / SIP Servers / Call Managers
5. Media Servers: Video Servers
6. Gateways
7. LANs and WANs
8. Key VoIP Standards
9. Where All of This is Headed: IP Dial Tone
This course can be taken by anyone who needs to get up to speed on all things VoIP. You will gain career-enhancing knowledge of the components and operation of Voice over IP systems, and learn what all of the jargon and buzzwords mean.
It also serves as a first pass through topics that are covered in greater detail in subsequent lessons.
Detailed Course Description
Lesson 1. Introduction
- Course overview, fundamental concepts
Lesson 2. VoIP Phones and Terminals
- Voice over IP phone: computer functions
- Telephone functions
- SIP client for call setup: SIP basics
- QoS and packet classification
- Softphones on computer screens
Lesson 3. Voice in IP Packets
- Digitizing and packetizing voice
- Tracing a phone call end-to-end
Lesson 4. SIP and Softswitches - SIP Servers / Call Managers
- Visit to a DMS-100 CO switch
- Softswitch vs. traditional PBX / CO switch
- SIP: finding out the called party’s IP address
- Hosted PBX
- Cloud servers: softswitch as a service
Lesson 5. Media Servers
- Video is where the money is
- Video server - Netflix server appliance
- Digital rights management
Lesson 6. Gateways
- Protocol converters
- Traditional DS0 telephony vs. Voice over IP
- Media gateway & Media Gateway Control Protocol
Lesson 7. LANs and WANs
- LANs: physical connection and MAC addresses
- Optical Ethernet in the core
- Power over Ethernet (PoE)
- LAN switches
- VoIP over Wi-Fi: 802.11
- WAN: between buildings
- Access, network service type, billing agreement
- Fiber, cable, DSL, wireless access
- Current IP WAN services
- Internet and Internet VPNs
- Service Level Agreement (SLA) and MPLS VPNs
- SIP Trunking
Lesson 8. Key VoIP Standards
- IETF RFCs
- SIP and SDP
- RTP: time stamps
- UDP and TCP over IP
- IP: network addresses for packets
- ITU G.711 voice and H.264 video codecs
- IEEE 802.3 Ethernet, 802.11 Wi-Fi,
- 802.2 MAC addresses & MAC frames
- Cat 5, 5e, 6 cables
- Optical Ethernet
Lesson 9. Where All of This is Headed: IP Dial Tone
- The IP-PSTN
- The Packet-Switched Telecommunications Network
- IP Dial Tone: send an IP packet to anywhere, anything
- Telephone network and Internet become the same thing: the IP-PSTN
- Telephone service = SIP
- Web surfing = DNS
- Value-added services: e.g. SIP Trunking
- Cloud SIP servers: Google Voice
- Underlying technologies: IP, MPLS and Ethernet
Thanks for the class. Very insightful. Currently learning more about the DMS 100 / 200 combo and translation.
Why?
nice....
V nice
Sir can you provide us the example of softswitch?
The vendors/providers?
Thanks for your question. The main softswitch vendors by sales are probably Cisco and Avaya.
What is CS2K sir?
That was the name of a software package installed on Nortel DMS-100 Central Office switches in 1999 to enable VoIP internally to the switch. 22 years ago! Time flies. Those switches are maintained by Avaya, who bought Nortel's switching division.
How did you get into the central office? I have worked in telecom for years and we never allowed anyone in, especially to take photos. It was a secure, proprietary area.
We were doing a lot of work for this very big telephone company, including developing training and an exam everyone in the Network Planning and Provisioning district had to take, preparing for the transition to the all-IP network, in 2002. (Which subsequently happened!). It was a big success. The senior technical guy provided a guided tour of the downtown CO.
I got to tour a rural CO as a kid, when I was around 9 years old. The kind old gentleman who managed the local telco let me walk all around and look at anything I wanted, so long as I didn't touch anything. I remember being wowed by the rows of racks, the constant ambient noise, and the massive clear lead acid battery packs. I then got to play Flight Sim on a (obviously non-essential) PC at his desk right next to the switch cabinets. My best guess is they were running a DMS-10 - this was a small telco serving a town of about 3k people and numerous surrounding farms, and would have been in the early 90s. I had a budding interest in computers and telecom, and that was definitely one of the experiences that got me started on that path. I'm glad that CO wasn't as secure as most others!