Convergence of voice and data is now a common place mainstream technology. Our Voice Over IP course investigates the characteristics of voice transmission and then studies the impact on IP networks. Practical sessions with soft phones, hard phones and gateways allow the students to see all aspects of VoIP. Network analysers are used to study packets on the wire.
Voice over IP, brief review of IP, brief review of telephones and voice.
What are softphones? Downloading, installing.
Hands on Building the base IP network, a simple VoIP call with softphones, Internet telephony.
E164, FQDN, IP addresses, URIs, DNS, SIP addressing, H.323 addressing.
Bandwidth, Delay, Jitter, digitising voice,
digitisation steps, coding, quality issues, MOS,
voice compression, silence suppression,
packetising voice, prioritising voice, jitter buffers.
Hands on Simple packet analysis.
Desktop, backbone, gateway, hard phones, PoE,
integrating phones and PCs, carriers,
Hands on Integrating Softphones, hard phones and analog phones.
ITU delay recommendations, IP DSCP field, DiffServ, IP precedence, queuing strategies; FIFO, WFQ, custom, priority, RED, LLQ.
RTP, RTCP, mixers and translators, RSVP.
Bandwidth, Erlang models, link layer overhead.
Hands on Calculating VoIP bandwidth, analysing RTP packets.
Architecture, protocols, terminals, Call setup,
Gatekeepers, gateway discovery, H.323
registration with a gatekeeper.
Hands on PC to PC using H.323.
What is SIP? SIP protocol stack, SDP, Sip
architecture, SIP messages, Initial SIP phone
startup, SIP servers, proxy server, redirect server.
Hands on PC to PC using SIP.
Signalling systems, SS7, media gateways, Media
gateway controllers, signalling gateways, MGCP,
Hands on PSTN interworking.
Video components, digital video, pictures and audio, video codecs, issues and solutions, video conferencing, multipoint video conferencing, video protocol stack.
"Very good instruction. Kept classes interesting and fun."
"The course gave the required amount of information and was very well presented."
This structured training course seeks to build upon workbook learning through the use of group exercises, dynamic discussion and individual tasks in order to deliver an engaging and interactive module that will ensure all candidates are able to transfer their new skills into the workplace.