Use the Call Transfer Flags window to configure flags related to call transfer processing in an IP Signaling Profile.

On the SBC main screen, use one of the following paths to navigate to Call Transfer Flags:

  • Configuration > System Provisioning > Category: Trunk Provisioning > IP Signaling Profile > Common IP Attributes > Call Transfer Flags 
  • Configuration > System Provisioning > Category: Call Routing > Profiles > IP Signaling Profile > Common IP Attributes > Call Transfer Flags
  • Configuration > Profile Management > IP Signaling Profile > Common IP Attributes > Call Transfer Flags
  • All  > Profiles > Signaling > IP Signaling Profile > Common IP Attributes > Call Transfer Flags

The Call Transfer Flags window opens. Select the IP Signaling Profile whose configuration you want to view or edit in the IP Signaling Profile list. The Edit Call Transfer Flags window opens, showing the current configuration for the selected profile.

Use the following table to configure the call transfer flags for the selected profile, and then click Save.

Parameter

Description

Handle IP Addresses Not Present In Network Selector Table Nst

Use this parameter to define how to handle a transferred call when the SBC does not perform a PSX query for new routes and the IP address in the Refer-To header is not present in the Network Selector table. The options are:

  • Reject Call – The SBC always rejects the call transfer.
  • Route Via Default Zone Iptg – The SBC sends out the call transfer INVITE from the default zone's IPTG.
  • Route Via Defaultiptg – This option is not applicable at this time.
  • Route Via Transferring Iptg – (default) The SBC sends out the call transfer INVITE from the transferring IPTG (the IPTG on which the REFER request arrived).

Force Re Route Via Psx Query

Enable this flag to allow the SBC to perform a PSX query for new routes instead of using the IP address received in the Refer-To header.

  • Disable – (default) When this flag is disabled, the SBC does one of the following:

    • If the IP address in the Refer-To header is zero or matches the SBC signaling IP address, the SBC performs a PSX query for new routes.
    • If the IP address in the Refer-To header does not match the SBC signaling IP address but is present in the SBC Network Selector table, the SBC sends an INVITE message to the IPTG selected from the Network Selector table.
    • If the IP address in the Refer-To header does not match the SBC signaling IP address and is not present in the SBC Network Selector table, the SBC handles the transfer according to the configuration of the Handle IP Addresses Not Present In Network Selector Table NST flag.

  • Enable – Enabling this flag causes the  SBC always to perform a PSX query for new routes, regardless of the IP address received in the Refer-To header.

Skip Re Route Via PSX Query

Use this parameter to specify whether the SBC queries the PSX for routes when the REFER trunk group differs from the original egress trunk group.

  • Disable – (default) When this flag is disabled, the SBC queries the PSX for routes if the REFER trunk group differs from the original egress trunk group.

  • Enable - When this flag is enabled, the SBC does not query the PSX for routes when the REFER trunk group differs from the original egress trunk group.



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