The From header setting affects the Referred-By header and the P-Asserted-Identity header. The To header setting does not affect Referred-By and P-Asserted-Identity. When you select the From header settings, the Referred-By header and P-Asserted-Identity header are automatically updated.
If the SIP message is from the Subscriber side, then Topology Hiding replaces the From Header with the next hop address or domain from the routing profile. If the SIP message is from the Call Server side or Trunk Server side, then Topology Hiding replaces the From Header with the Signaling Interface. This scenario occurs in the following settings:
Header: From
Criteria: IP/Domain or IP or Domain
Replace Action: Auto
Topology Hiding replaces the From header with the next hop address/domain from the Routing profile. This scenario occurs in the following setting:
Header: From
Criteria: IP/Domain or IP or Domain
Replace Action: Next Hop
Topology Hiding replaces the From header with the Destination IP from the SIP Message. This scenario occurs in the following settings:
Header: From
Criteria: IP/Domain or IP or Domain
Replace Action: Destination IP
Topology Hiding replaces the From header with the Signaling Interface IP/Domain. This scenario occurs in the following settings:
Header: From
Criteria: IP/Domain or IP or Domain
Replace Action: Signaling Interface
Topology Hiding replaces the From header with the Overwrite Value. This scenario occurs in the following settings:
