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• Contact header information is used to form the R-URI of the redirected INVITE.
• Embedded Route header information is used for determining the egress IPTG and next hop of the redirected INVITE.
  • Route header with FQDN or IP Address pointing to SBC the

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     (received FQDN matches configured FQDN of zone on which 3xx is received or received address matches Signaling Ports address) is removed.
  • Egress IPTG selection is based on the following criteria in the order shown.
    • Embedded Route header parameters presence.
      • dtg parameter if dtg is present.
      • tgrp parameter if tgrp and trunk-context are present and processTgrpContext is enabled and trunk-context points to SBCthe

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        .
      • tgrp parameter if tgrp is present.
    • "skipDTGLookupForRouteHdr” flag.
      • Network Selector Table (NST) lookup (using embedded Route header content and zone on which the 3xx is received) if this flag is disabled (for the IPTG that received the 3xx).
      • PSX/ERE routing analysis (embedded Route header content is used as the called party information) if this flag is enabled.
  • Top-most Route Header not pointing to SBC is used for determining the next hop.
• Embedded From header information is used as the calling party. Embedded To header is the new To header in the redirected INVITE.
• All embedded headers received are present (in non-embedded form) in received order in the redirected INVITE (other than any removed Route header pointing to SBC and headers which replace the ingress INVITE headers).

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For configuration details, seerefer to:

• CLI: Egress IP Attributes - SIP - CLI
• EMA: Redirect - Flags (EMA)

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