Introduction

The entry fields "Asserted Identity" within Gateway Groups enables a outgoing Call Forward of an originally PSTN call

via a SIP Trunk.

Normally SIP provider check the calling number of a outgoing call because they are committed to ensure the correctness

of the used CLI.This is done by the network provided value Asserted Identity.

If Call Forward is configured and an incoming call from PSTN is redirected towards the PSTN via a SIP Trunk the following

aspects must be respected.

• Without the use of the "Asserted Identity" function the PBX keeps the origin calling number
  within the outgoing SIP message. If this calling number is unknown for SIP provider the call is rejected.
• With the use of the "Asserted Identity" function the PBX replaces the origing calling number  with the calling number
  of an own extension. The provider recognizes the calling number as own  number and accepts the call.