Table Of Contents
Hiding the Internal Topology Information Embedded Within the History-info Header at the Cisco UBE
SIP History-info stores information on address, topology and so on. Cisco UBE has the address hiding security feature where only the host section of a History-Info header is masked with the CUBE address. However, it does not hide the topology information like the details of the targets where a request was tried upon. It is important to strip the topology information from Cisco UBE before it is passed on to an external device. When the topology hiding for history-info is enabled, the diversion headers are also stripped from the history-info header. Topology information hiding has to be enabled on both inbound and outbound call legs. For example, if topology informatione is enabled only on the outbound dial-peer, this results in stripping all the History-info headers it received from the inbound leg and it sends just the single History-info header. However, on the inbound leg, all the History-info headers received from the outbound leg will be passed on to the external devices. If this feature is enabled on both inbound and outbound dialpeers, then the History-info headers will be stripped for both inbound and outbound legs of Cisco UBE.
Restrictions for Hiding the Internal Topology Information Embedded Within the History-info Header at the Cisco UBE
•The user needs to be in the same network as the network in which the call is received.
•Topology hiding will result in the History-Info headers received on one call leg to be stripped on the other leg and this could result in the call-routing functionality to disfunction. Hence, topology hiding and call-routing are mutually exclusive and cannot function together.
This section contains the following procedures:
Hiding Internal Toplogy Information in History-info Header at global level
Perform this task to hide topology information in history-info header at a global level in SIP configuration (conf-serv-sip) mode.
2. configure terminal
3. voice service voip
Hiding Internal Toplogy Information in History-info Header at the Dial-Peer Level
Perform this task to hide topology information in history-info header header support at the dial-peer level, in dial peer voice configuration (config-dial-peer) mode.
2. configure terminal
3. dial-peer voice tag voip