3Com VCX V7122 SIP VoIP Gateway User Manual 47Advanced ParametersUse this submenu to configure the following gateway’s advanced control protocolparameters. Disconnect and Answer Supervision CDR and Debug Miscellaneous Parameters Supplementary ServicesNumber Manipulation TablesThe VoIP gateway provides four Number Manipulation tables for incoming and outgoingcalls. These tables are used to modify the destination and source telephone numbers so thatthe calls can be routed correctly.The Manipulation Tables are: Destination Phone Number Manipulation Table for IPÆTel calls Destination Phone Number Manipulation Table for TelÆIP call Source Phone Number Manipulation Table for IPÆTel calls Source Phone Number Manipulation Table for TelÆIP callsPossible uses for number manipulation can be as follows: To strip/add dialing plan digits from/to the number. For example, a user could dial 9 infront of each number to indicate an external line. This number (9) can be removed herebefore (after) the call is setup. Assignment of NPI/TON to IPÆTel calls. The VoIP gateway can use a single globalsetting for NPI/TON classification or it can use the setting in this table on a call by callbasis. Control for this is done using “Protocol Management>ProtocolDefinition>Destination/Source Number Encoding Type”. Allow / disallow Caller ID information to be sent according to destination / sourceprefixes.To configure the Number Manipulation tables, follow these steps:1 Open the Number Manipulation screen you want to configure (Protocol Managementmenu > Manipulation Tables submenu); the relevant Manipulation table screen isdisplayed. Figure 19 shows the ‘Source Phone Number Manipulation Table for TelÆIPcalls’.Number manipulation can be performed either before or after a routing decision ismade. For example, you can route a call to a specific trunk group according to itsoriginal number, and then you can remove/add a prefix to that number before it isrouted. To control when number manipulation is done, set the ‘RouteModeIP2Tel’and the ‘RouteModeTel2IP’ parameters. For information on these parameters, seeTable 28 on page 119.
