BusinessPhone Communication Platform 5.1
Facilities

## ISDN SS Call forwarding with Partial Rerouting (CF/PR)

## Definition / Use

The Call Forwarding/Partial Rerouting ISDN supplementary service allows the served user to perform a call forwarding without using the external or internal ASB 150 02 resources.

## Operation

The CF/PR ISDN supplementary service allows the served user to perform a call forwarding without using the external or internal ASB 150 02 resources (e.g trunk lines and PCM channels). If the conditions needed for the Partial Rerouting are fulfilled, ASB 150 02 can request from the public ISDN network to reroute the call and set up the call to a new destination in the ISDN network using only the resources of the public ISDN network.

The following internal diversion/follow-me services are taken into consideration with the corresponding ISDN CF services:

- Individual External Diversion (CFU)
- Direct Diversion and Follow-me with Common Abbreviated number that respond to an external destination (CFU)
- Diversion on Busy with Common Abbreviated number that respond to an external destination (CFB)
- Diversion on No Reply with Common Abbreviated number that respond to an external destination (CFNR)

The Partial Rerouting is not an independent ISDN supplementary service. The Partial Rerouting is a subscription option of the appropriate (CD, CFU, CFB, CFNR) ISDN supplementary service.

As a network provider option, if the AOC-E supplementary service is activated and CF/PR supplementary service has been invoked, the network can send charging information to the forwarding (served) user when the forwarded call is released. The received charging information is sent to the respective call meter of the extension.

Depending on the network provider the served user ( In the public ISDN network point of view ASB 150 02 is the served user ) can be charged for the call forwarding and also can be charged for some part of the diverted call. This information is known only after releasing the forwarded call. The information sending is independent from the actual traffic state of the trunk, the AOC-E information related to a forwarded call can be received every time.

In case the public network rejetcs the CF/PR supplementary service request, the external rerouting will be performed by using ASB 150 02 resources.

## Capacity / Limitations

The ISDN SS CF/PR feature is not supported (carried) over the private network.

As a service provider option, the CFx services can be provided on per ISDN number basis, or can apply to the whole access. In the implementation the per ISDN number basis option is not considered.

As a service provider option, the CFx services can be subscribed to all basic services or a particular basic service(s) can be identified for wich the CFx service shall apply. In ASB 150 02 only the all services variant is considered.

In case of Individual External Diversion of an external (incoming) call the Partial Rerouting can be used.

In case of Fixed Diversion of an external (incoming) call the Partial Rerouting also can be used.

In case of Diversion on Busy and No Reply of an external (incoming) call the Partial Rerouting can be used.

CF/PR feature can not be combined with other type of external diversions or routing features. I.e. for ISDN lines where the CF/PR is activated then all the incoming calls will be deflected back to the network. But in case if a CF/PR request fails for some reason then the call may be external diverted through the system, e.g. by using LCR.

## Programming

1972 |  | Call Forwarding with Partial Rerouting is subscribed

## Equipment

BTU-D with ISDN prom set or BTU-B_ or MFU.

To use the CF/PR the Basic R13 FECU or higher is requested.

Revision: K © Ericsson Enterprise 2003