ISSUES IN MIGRATION TOWARD

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ISSUES IN MIGRATION TOWARD NEW GENERATION
NETWORKS ARCHITECTURE
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IP based Transit network
Application Server
Application Server
CCS7 Over IP
CCS7 Over IP

BICC/ SIP-T
Soft Switch
Soft Switch
Signaling Gateway
Signaling Gateway
H.248/ MGCP
H.248/ MGCP
CCS 7
CCS 7
IP
TDM
TDM
MGW
MGW
MGW
MGW
MGW
MGW
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Issues to be addressed

• Competing Protocols Two protocols for the same
  purpose by two different bodies create
  confusion e.g. BICC/SIP-T are the protocols for
  communication between two soft switches. BICC has
  been developed by ITU-T and SIP-T by IETF. It
  would be better if a single protocol is developed
  and improved upon in order to make it futuristic.
• 2.Quality of Service, reliability and security
  for communications between subscribers from
  different access networks.

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• 3.Evolution of access network into multiservice
  environment (Interoperability of services) Even
  though one might argue that the protocols and
  networks are deployed based on the services
  planned by the operator, inter-operability of
  equipment and services in a multi-operator
  scenario is a critical issue. Use of different
  protocols in different networks will further
  intensify the problem
• 4. Up gradation with backward compatibility
• 5. Test facilities Comprehensive test schedule
  and test facilities are required to test
  inter-working of protocols.

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• 6. Operating costs Over the years, large
  investments have been made by incumbent operators
  in circuit-switched networks. For operators
  planning to migrate to NGN architecture,
  operating costs play a vital role while the
  changes are being carried out. The main question
  is whether a multi-service networks leads to
  lower cost of operation compared to the existing
  ones. Such studies are to be carried out so that
  the operators may take decision for the
  migration.
• 7. Planning guidelines are to be formulated How
  many media gateways can be controlled by One
  soft switch? How many soft switches will be
  sufficient for migration from circuit switched
  PSTN to packet-based network in a large network?

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Recommendations

• In view of the above, various standardising
  bodies should make coordinated efforts for
  preparing comprehensive standards and guidelines
  for smooth migration into packet-based
  multi-service networks ensuring interoperability
  of equipment, and quality of service.

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• Thank You