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WHAT IS VOIP

IP BASED TELEPHONY (VoIP Solutions for Implementation at SSGC ) PREPARED BY: MR. HAYAT BHANGAR CE(TELECOM). WHAT IS VOIP. VoIP refers to a way to carry phone calls over an IP data network, whether on the Internet or our own internal network. Basic Working.

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WHAT IS VOIP

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  1. IP BASED TELEPHONY(VoIP Solutions for Implementation at SSGC)PREPARED BY:MR. HAYAT BHANGARCE(TELECOM)

  2. WHAT IS VOIP • VoIPrefers to a way to carry phone calls over an IP data network,whether on the Internet or our own internal network.

  3. Basic Working • VoIP technology digitizes analog voice, compresses it, and puts it into packets at the sending end. • Data and voice packets share the same LAN infrastructure. • The receiving end does the reverse.

  4. BENEFITS OF USING VOIP • Bandwidth Efficiency • Soft Switching • Distributed Architecture • Packet Switching • Cost Reduction Transmitting data when the user is quite

  5. Standard Based Platform for Call Control • Soft Switches. • Send messages to the border element with instructions to where to send the call. • Check to see which services the caller is entitled to use. • Communicate with billing system. • Send a message to the network setting up path between caller and end point.

  6. PSTN Versus VoIP: A Feature Comparison

  7. VOIP NETWORK ELEMENTS • SIGTRAN: SIGNALING GATEWAY Translates Signals from Public Switch Network Protocol (SS7) into IP packets and vice versa. • MGC : MEDIA GATEWAY CONTROLLER A soft switch that switches calls between the SG and MG and controlling access from the IP world to/from the PSTN. For example E1 and IP networks. • MG : MEDIA GATEWAY Responsible for packetization of voice traffic and transmitting the traffic towards the destination and vice versa.

  8. VOIPARCHITECTURE SS7 SS7 Media Gateway Controller PABX Switch Media Gateway Controller PABX Switch SIP SIGTRAN SIGTRAN RTP/ RTCP USER A USER B MEDIA GATEWAY MEDIA GATEWAY

  9. Signaling Protocols • SIP (Session Initiating Protocol) • MGCP (Media Gateway Control Protocol) • H.323 • RTP (Real Time Transport Protocol)

  10. SIGNALING SYSTEM IN A TRADITIONAL PSTN • PSTN ensures automatic signaling system. • Digital signals are used by network switches to establish a communication session. • Modern telephony separately deals the tasks of data transfer and voice signaling.

  11. SIGNALING SYSTEM #7 (SS7) INTRODUCTION • The latest version of Common Channel Signaling. • A worldwide standard for control signaling in Telephone networks. • Packet switched data network. • Facilitates communication within centralized offices as well as long distance switching centers. • An efficient system allowing immense data sending capacity with a high speed.

  12. FEATURES • Call management • Local number portability • Billing mechanisms • Short message service • Voice mail • Credit card validation

  13. ss7CALL mechanism LONG DISTANCE SWITCH TANDOM OFFICE SWITCH NETWORK CENTRAL OFFICE SWITCHES USER C USER A USER B

  14. Session Initiation Protocol (SIP) • INTRODUCTION • Signalingprotocol for controlling communication sessions over IP. • FEATURES • Modifying and tearing down sessions • User registrations • Defining session routing

  15. SIP CALL FLOW

  16. DIFFERENCES BETWEEN SS7 AND SIP

  17. WAYS OF USING VOIP • PC to PC • PC to Phone • Phone to PC • Phone to Phone

  18. MEDIA GATEWAY

  19. CALLS WITHIN A SINGLE SIP-IP TELEPHONY NETWORK Application Services 2 SIP 1 SIP 3 SIP IP Phone A SIP Proxy Servers SIP IP Phone B RTP

  20. VOIP in SSGC • Engineering Order Wire Being Run on VOIP • IPTU • Spanning Tree Protocol (Self Healing)

  21. FUTURE OF VOIP IN SSGC • Integration of VOIP in Microwave Network • FXS and FXO on VOIP

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