General Information on Interconnecting with SIP Providers

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When interconnecting an ISDN System with a SIP Service Provider several aspects of the communication flow need to be considered. During a call different phases of signalling occur and the call has multiple attributes.

The call/session phases are:

  1. call setup
  2. call connect
  3. call disconnect


During the call setup phase most attributes of the call are clear already. The most important attributes are typically:

  • Destination Address Information
  • Source Address Information
  • Media Definition