94 V6100 and V7122 User GuideConfiguring the Routing TablesUse this submenu to configure the gateway’s IPÆTel and TelÆIP routing tables and theirassociated parameters.Tel to IP Routing TableThe Tel to IP Routing Table is used to route incoming Tel calls to IP addresses. This routingtable associates a called / calling telephone number’s prefixes with a destination IP addressor with an FQDN (Fully Qualified Domain Name). When a call is routed through the VoIPgateway (Proxy isn’t used), the called and calling numbers are compared to the list ofprefixes on the IP Routing Table (up to 50 prefixes can be configured); Calls that matchthese prefixes are sent to the corresponding IP address. If the number dialed does not matchthese prefixes, the call is not made.When using a Proxy server, you do not need to configure the Telephone to IP Routing Table.However, if you want to use fallback routing when communication with Proxy is lost, or to usethe ‘Filter Calls to IP’ and IP Security features, or to obtain different SIP URI host names (percalled number), you need to configure the IP Routing Table.For the Tel to IP Routing table to take precedence over a Proxy for routing calls,set the parameter ‘PreferRouteTable’ to 1. The gateway checks the 'Destination IPAddress' field in the 'Tel to IP Routing' table for a match with the outgoing call.Only if a match is not found, a Proxy is used.Possible uses for Telephone to IP Routing can be as follows: Can fallback to internal routing table if there is no communication with the Proxy. Call Restriction – (when Proxy isn’t used), reject all outgoing TelÆIP calls that areassociated with the destination IP address: 0.0.0.0. IP Security – When the IP Security feature is enabled (SecureCallFromIP = 1), the VoIPgateway accepts only those IPÆTel calls with a source IP address identical to one of theIP addresses entered in the Telephone to IP Routing Table. Filter Calls to IP – When a Proxy is used, the gateway checks the TelÆIP routing tablebefore a telephone number is routed to the Proxy. If the number is not allowed (numberisn’t listed or a Call Restriction routing rule was applied), the call is released. Always Use Routing Table – When this feature is enabled (AlwaysUseRouteTable = 1),even if a Proxy server is used, the SIP URI host name in the sent INVITE message isobtained from this table. Using this feature, users are able to assign a different SIP URIhost name for different called and/or calling numbers. Assign Profiles to destination address (also when a Proxy is used). Alternative Routing – (When Proxy isn’t used) an alternative IP destination for telephonenumber prefixes is available. To associate an alternative IP address to called telephonenumber prefix, assign it with an additional entry (with a different IP address), or use anFQDN that resolves to two IP addresses. Call is sent to the alternative destination whenone of the following occurs:
