User`s manual

5. Ways of connecting 2N

GSM ISDN GATEWAY Lite

The ISDN GSM gateway is used to route calls from ISDN lines to GSM modules.

The gateway can be connected as follows:

• Gateway as NT ( simulates a network ) in configuration Point-to-Point and Point-to-Multipoint.

• Gateway as TE ( simulates a phone) in configuration Point-to-Point and Point-to-Multipoint.

Among other things, it supports the following functions:

• Routing calls depending on called destination via the provider of this destination

• Call forwarding

• Intelligent incoming CLIP routing

• Outgoing time LCR routing

• Mobility extension (remote GSM extension)*

• DISA (tone DDI)

• DISA to GSM (dial-in tone from ISDN TE ports to GSM networks)

• Callback to GSM networks

• Direct call to operator

• SMS send/receive

* A license key is required for the activation of the Mobility extension function.

5.1. Routing principle

The ports in the gateway are logically divided into internal and external ones (according to

configuration). A call from an internal port is routed to GSM port according to the routing

algorithm. A call from an external port is routed directly to the internal port (TE1/NT1) or DISA

(tone DDI) is activated, or it is rerouted to the operator 1 or 2. Further, an incoming call may also

be routed according to CLIP (incoming call number). ISDN port is internal, GSM ports are

external.

The routing algorithm recognises incoming call types, the current time rate, day in a week,

or free minutes of the GSM provider and routes outgoing calls accordingly.

If an outgoing call is routed through a busy port, another available port is dialled

(depending on configuration). If none of allowed outgoing ports is free, the outgoing call is

rejected. For details on this function see section ISDN GSM program, rates (6.5.7).