About the Course

This course provides a detailed overview of the key technologies behind VOIP, including speech coding, packet transport and VOIP signalling protocols. The course will cover the history behind VOIP technologies to show how that has driven the current capabilities and it will also look at the latest technological advances in areas such as toll bypass and Mobile-IP.

1. Introduction to VOIP
2. Low level protocols - RTP / RTCP / UDP etc.
3. Speech coding technologies - PCM, ADPCM, LPC etc.
4. Standard speech codecs - ITU Series and wireless codecs including fixed and variable rate.
5. Transcoder technologies including: DTMF generation and detection, Echo cancellation, Voice Activity Detection and discontinuous transmission (VAD / DTX), Packet Loss Concealment (PLC).
6. Call and Session Control Protocols:
* SIP (IETF SIP, 3GPP SIP, SDP and Offer/Answer model, open issues).
* H.323 (RAS, H.225, H.245, Slowstart & FastStart, H.245 tuneling, 3rd party call control, open issues).
* o MGCP (for trunk GW control, analogue GW control, IP phone and user interface control -RFC 3149).
7. Common practical issues : NAT traversal, Call redirection.
8. The 3GPP and TISPAN architecture, with a focus on call flows:
* P-CSCF, I-CSCF, S-CSCF, AS and related call flows.
* TISPAN Simulated and Emulated models.
* Open issues.
9. Network dimensioning

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