Script to route on TGRP integrated with C15 and ClearIP

[NicoleTan]

#1 Call from C15: Call will be sent to PBXs or Carriers
  1) Call to PBX
                   - Get the tgpr from the request-uri
 - Use this tgrp to match the destination nap
 - Check the destination NAP has send_clearip_flag=NO
 - Create the route to destination NAP (PBX)
 - Call sent to the destination NAP (PBX)
 
  2) Call to Carrier --- requires to do Stir/Shaken signing
                   - Get the tgpr from the request-uri
 - Use this tgrp to match the destination nap
 - Check the destination NAP has send_clearip_flag=YES
 - Reserver the send_clearip_flag as params[:user_context][:send_clearip_flag_out]
 - Reserver the desitnation nap name as params[:user_context][:dest_nap]
 - Call send to ClearIP
 - ClearIP returns 302 with Identity header
 - Check params[:user_context][:send_clearip_flag_out] = YES
 - Create the route to params[:user_context][:dest_nap]
 - Call sent to params[:user_context][:dest_nap] (Carrier) with identity
 
#2  Call from PBX or the Carriers: Call shall be sent to C15 with tgrp value in the request-uri
  1) Call from PBX
                    - Get the tgpr from Naps column by the incoming NAP name
 - Check the incoming NAP has send_clearip_flag=NO
 - Send the call to C15 by static route with tgpr value in the request-uri

  2) Call from Carrier --- requires to do Stir/Shaken signing
                   - Get the tgpr from Naps column by the incoming NAP name
 - Check the incoming NAP has send_clearip_flag=YES
 - Reserver the send_clearip_flag as params[:user_context][:send_clearip_flag_in]
 - Send the call to ClearIP
 - ClearIP returns 302 with Identity header
 - Check params[:user_context][:send_clearip_flag_in] = YES
 - Send the call to C15 by static route with tgpr value in the request-uri, and the Identity from 302

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