Call routing241System functions and features as of R3.0syd-0367/1.3 – R3.0 – 03.20136. 7 Exchange-to-Exchange ConnectionExchange-to-exchange traffic covers all interactions involving at least 2 users in thepublic network and at least 1 internal user.6. 7. 1 Exchange-to-Exchange ConnectionsIn an exchange-to-exchange connection two seized exchange lines to the publicnetwork are connected with each other locally in the communication server.Restrictions applicable throughout the systemExchange-to-exchange traffic can be restricted or barred throughout the system.The setting is not effective for inter-network connections to the public network orto on one side only, e.g. PISN-PISN or PISN-exchange.The system supports exchange-to-exchange traffic on both digital and analoguenetwork interfaces. The following settings are possible:• Not enabled: Exchange-to-exchange connections not allowed• Digital-digital only: Both network interfaces must be digital• Digital-analogue also: At least one network interface must be digital• Analogue-analogue also: Both network interfaces can be analogueIf sections of exchange-to-exchange connections are analogue, the transmissionquality will decrease.If a user tries to set up an inadmissible exchange-to-exchange connection (e.g. byinitiating an exchange enquiry call and then hanging up), the second connection isdisconnected and user B obtains long ringing after hanging up, to be able to an-swer the first connection on hold. This is the case for example if one or both net-work interfaces are analogue and the parameter is Exchange-to-exchange connec-tion = Digital-digital only.Tip:In some countries private operators of communication systems are notauthorized to transfer an outside call back to the public network. Explainthe situation regarding operating rights to operators of communicationservers already at the negotiation stage.
