Implementing a Voice Over Internet (Voip) Telephony System

1
Implementing a Voice Over Internet (Voip)
Telephony System

• Final Project report
• Presented by Md. Manzoor Murshed

2
Objectives

• Voice Over IP
• SIP
• H.323
• MGCP
• Simulation using Westplan
• Conclusion

3
Voice over IP

• provide the functionality required to set up,
  manage, and tear down calls and connections
• be scalable to support a very large number of
  registered endpoints (in the order of billions
  worldwide), and a very large number of
  simultaneous calls (in the order of millions
  worldwide)
• support network management features for policy
  control, accounting, billing, etc
• provide a mechanism to communicate and set up the
  Quality of Service requested by the end points
• be extensible to help with adding new features
  easily
• support interoperability among different vendors
  implementations, among different versions of the
  signaling protocol, and with different signaling
  protocols.

4
Multimedia Protocol Stack
5
Registration Process
6
SIP COMPONENTS AND MESSAGES

• Invite Indicates that the user or service is
  being invited to participate in a session.
• Ack Confirms the client has received a final
  response to an Invite request.
• Options Is used to query a server about its
  capabilities.
• Bye Is sent by a User Agent Client to indicate
  to the server that it wished to release the call.
  
• Cancel Is used to cancel a pending request.
• Register Is used by a client to register an
  address with a SIP server

7
SIP COMPONENTS AND MESSAGES

• 1xx Informational- The request has been received
  and processing is continuing.
• 2xx Success An Ack, which indicated that the
  action was successfully received, understood, and
  accepted.
• 3xx Redirection Further action is required to
  process this request.
• 4xx Client Error The request contains bad
  syntax and cannot be fulfill at this server.
• 5xx Server Error The server failed (for
  internal reasons) to fulfill an apparently valid
  request.
• 6xx Global Failure The request cannot be
  fulfilled at any server.

8
Architecture
9
Signaling Systems and Messages
10
THE H.323 MULTIMEDIA STANDARD
11
SIMULATION 1 WITH WESTPLAN SIMULATOR
12
Link Summary
13
Optimization results
14
Link Traffic analysis
Node Transmission medium Entry Network resource Entry network voice channels
Ames PSTN - Waterloo IPBX T1 (24 B channels) 1 trunk 24
DesMoines IPBX - Waterloo IPBX Voice over IP (PPP) 512 kbps 40
Ames PSTN - DesMoines IPBX T1 (24 B channels) 1 trunk 24
DesMoines IPBX - Fayette Gateway Voice over IP (PPP) 256 kbps 20
Fayette Gateway - West Union PBX Analogue 15 trunks 15
Independence PSTN - West Union PBX T1 (24 B channels) 1 trunk 24
Fayette Gateway - Independence PSTN T1 (24 B channels) 1 trunk 24
15
Link and Traffic Analysis
16
Conclusion

• Questions?