What are the functions of call routes

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Call routes bind outgoing call prefixes to trunk groups to map outgoing call prefixes and trunks.

Other related questions:
What is the call route of the AR router
A call route binds an inter-office call prefix to a trunk group so that calls with the specified call prefix are transmitted on the specified trunk line.

What is the purpose of an OSPF route tag
OSPF route tags are used in only Virtual Private Network (VPN) scenarios to prevent Type 5 link-state advertisement (LSA) loops in Customer Edge (CE) dual-homing networks. When OSPF detects that the route tag of a Type 5 LSA is the same as a route tag on the Provider Edge (PE) router, this route is ignored. When a CE router is connected to two PEs, PE1 sends the Type 5 LSA generated based on the redistributed Border Gateway Protocol (BGP) route. The CE then forwards this LSA to PE 2. Because an OSPF route has a higher priority than a BGP route to the CE, PE 2 replaces the BGP route with the OSPF route. Thus, a routing loop occurs. With a route tag configured, when the PE detects that the route tag of the LSA is the same as that of its route tag, the PE ignores the LSA, thereby avoiding routing loops. The default route tag is calculated based on the AS numbers in the BGP. If BGP is not configured, the default value of route tag is 0.

What call barring functions does the U1900 support?
The U1900 supports outgoing call barring, anonymous call barring, call barring based on simple card number, PIN code, and call barring based on user rights. For detailed configurations, see the U1900 product documentation.

When the U1960 serves as a tandem device, can the call source routing reanalysis function be implemented?
No. The route reanalysis function must be implemented on the peer device.

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