PHS MoU Document
B-SV2.10-01-TS
Title: Public Personal Handy-phone System : Service Specifications ofCall forwarding Services
Version: 01
Date: Dec. 17, 1996
PHS MoU Classification: Unrestricted
List of contents:
1.

Call Forwarding Unconditional

2.

Call Forwarding on PS Busy

3.

Call Forwarding on No Reply

4. Call Forwarding on PS Not Reachable (CFNRc)

Number of pages: 19

PHS MoU Group
c/o Association of Radio Industries and Businesses (ARIB)
14F, Nittochi Bldg., 4-1, Kasumigaseki 1-choume, Chiyoda-ku, Tokyo 100, Japan
TEL +81-3-5510-8599 FAX +81-3-3592-1103© PHS MoU Group1996

PHS MoU Document
B-SV2.10-01-TS
Version01

History of Revised Versions
Date
Outline17 Dec. 1996

EstablishedB-SV2.10-01-TS
Public Personal Handy-Phone System:
Service Specifications of Call forwarding Services

Contents
1 Call Forwarding Unconditional ........................................................................................... 1
1.1 Definition ....................................................................................................................... 1
1.2 Description..................................................................................................................... 1
1.3 Procedures...................................................................................................................... 1
1.4 Network capabilities for charging.................................................................................. 4
1.5 Interworking requirements............................................................................................. 4
1.6 Interaction with other supplementary services .............................................................. 4
2 Call Forwarding on PS Busy................................................................................................. 6
2.1•Definition....................................................................................................................... 6
2.2 Description..................................................................................................................... 6
2.3 Procedures...................................................................................................................... 7
2.4 Network capabilities for charging.................................................................................. 9
2.5 Interworking requirements............................................................................................. 9
2.6 Interaction with other supplementary services .............................................................. 9
3 Call forwarding on No Reply............................................................................................... 11
3.1 Definition ....................................................................................................................... 11
3.2 Description.................................................................................................................... 11
3.3 Procedures...................................................................................................................... 12
3.4 Network capabilities for charging.................................................................................. 13
3.5 Interworking requirements............................................................................................. 14
3.6 Interaction with other supplementary services .............................................................. 14
4 Call Forwarding on PS Not Reachable (CFNRc) ................................................................ 15
4.1 Definition ....................................................................................................................... 15
4.2 Description .................................................................................................................... 15
4.3 Procedures ..................................................................................................................... 16
4.4 Network capabilities for charging.................................................................................. 18
4.5. Interworking requirements ............................................................................................ 18
4.6. Interaction with other supplementary services ............................................................. 18

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1 Call Forwarding Unconditional
1.1 Definition
Call forwarding unconditional(CFU) permits a “served user”(see 1.2.2) to have the network send toanother number all incoming calls for the served user’s PHS number(or just those associate with a
specified basic service). The served user’s originating service is unaffected. If this service isactivated, calls are forwarded no matter what the condition of the termination.
Other call forwarding service provide for call forwarding based on condition of the air and thetermination, e.g. Call Forwarding Busy(CFB), Call Forwarding on No Reply (CFNRy) and Call
Forwarding No Reachable(CFNRc).
The forwarded-to number is registered with the network for use on all calls.
1.2 Description
1.2.1

General Description

For a given PHS number, Call Forwarding Unconditional service (including options) may be
subscribed to for each basic service to which the user(s) of the number subscribes, or collectively for
all the basic services to which the user(s) subscribes.
The served user can request a different forwarded-to number for each basic service subscription
parameter value to which he has subscribed.
A notification that the CFU service is activated may, as an option, be given to the user who has
forwarding activated, each time an outgoing call is made. This may take the form of a special
notification in the proceed response.
1.2.2

Specific terminology

Served user : User of a particular PHS number who is requesting that calls to his number be
forwarded. This user may also be referred to as the forwarding user or the called user.
Forwarded-to-user : User to whom the call shall be forwarded.
1.2.3

Qualifications on the applicability to telecommunication service

No restrictions identified.
1.3 Procedures
1.3.1 Provision/withdrawal
CFU shall be provided after pre-arrangement with the service provider.
The service can be offered with subscription options. Options apply separately to each basic service
subscribed to on each PHS number. For each subscription option, only one value can be selected.
Subscription options are summarized below:

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Table 1-1/B-SV2.10 Subscription option values
Subscription options
ValuesServed user receives notification that No
the call has been forwarded
Yes, with information about the call
Calling user receives notification
Nothat the call has been forwarded
Yes, without the forwarded-to user
numberYes, with the forwarded-to user
numberServed user receives notification that No
CFU is currently activatedYes
Served user releases his/her number No
to forwarded-to user
Yes
Note - Subscription options may be provided as a network provider options.

This service will be withdrawn by the service provider at the subscriber’s request or foradministrative reasons.
1.3.2 Normal procedures
1.3.2.1 Activation/deactivation/registration
If the served user has subscribed to CFU, the served user will use the activation procedure. To
activate CFU, the served user may supply:(1) the forwarded-to address;(2) information as to whether all calls or all calls of a specified basic service should be forwarded;
As a network option, verification of the forwarded-to number should be accomplished, if possible,
before accepting the call forwarding request.
When the served user so activates CFU, the service provider will return notification of acceptance orrejection of the request (see Exceptional procedures, 1.3.3, for a list of possible causes for rejection).
This notification may include the number of forwarded-to users to whom the call forwarding is active.
As a service option, activation/deactivation may be restricted to selected terminals (users) (e.g. by useof a password).
CFU can be deactivated in next way. The user can specifically deactivate the CFU activation.
1.3.2.2 Invocation and operation
When CFU is active, all incoming calls will be forwarded without being offered the served user.
When an incoming call is forwarded without being offered to the served user, the served user, as a
subscription option, may receive notification of the call forwarding (but will not be able to answer theincoming call). This notification is given as soon as the forwarding attempt is started.
The forwarded-to user may receive an indication that the call has been forwarded.

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When multiple forwarding occurs, the reason for forwarding given to the forwarded-to user should
relate to the last forwarding user in the chain.
As a subscription option, the served user can request that the calling user receives a notification thatthe call has been forwarded (a notification may include the reason for forwarding and the forwardedto number).
Transfer of the forwarded-to user’s number to the calling user, may be subject to number notification
restrictions due to invocation of other supplementary services at the forwarded-to user.
1.3.3

Exceptional procedures

1.3.3.1 Activation/deactivation/registration
1.3.3.1.1 Activation
Call Forwarding Unconditional for all basic services and Call Forwarding of particular basic services
cannot be activated simultaneously. If the PHS network cannot accept an activation request, theserved user should receive a notification that call forwarding activation was unsuccessful. For
example possible causes are :(1) service not subscribed;(2) forwarded-to number invalid;(3) forwarded-to number’s telecommunication service violate subscribed constraints (e.g.
group restrictions);(4) insufficient information;(5) requested telecommunication service is not provided to the forwarded-to number;(6) forwarded-to number is a special service code (e.g. police);(7) forwarded-to number is served user’s number.
However, the network is not required to validate information related to the forwarded-to user.
1.3.3.1.2 Deactivation
If the user does not specify completely which CFU request is to be deactivated (e.g. the basic service
and/or the originator’s number), the network will reject the deactivation request with appropriatecause.
If the network cannot accept a user’s request for deactivation, the cause will be returned to the user,e.g. incorrect origination PHS number used.
1.3.3.2 Invocation and operation
Call forwarding applies only to subscribed basic services. Calls to an PHS number requesting a basic
service which is not subscribed to, will never be forwarded.
In cases where a user may be given the address of users involved in the call (e.g. when the forwardedto user may receive the forwarding user’s address) as part of that user’s notification and this address
information is unavailable (e.g. due to address presentation restriction), the user who would have been
given the address shall get an indication on the reason why no number can given.
The total number of all forwarding for each call may be limited. This is to prevent infinite looping.
If the limit is reached and an attempt is made to forward the call an additional time, then the

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forwarded call shall be treated as follows:
If the forwarded call cannot be completed to the forwarded-to destination, then the network will clear
the forwarded leg of the call. Specifically, if CFU has been invoked, then the call would be clearedback towards the calling user. If the call has not previously undergone CFNRy and so on, the call will
be cleared all the way back to the calling user and the calling user will be informed that no user is
responding. This information shall not explicitly reveal that the call has been forwarded.
1.3.4 Alternative procedures
None identified
1.4 Network capabilities for charging
This specification does not cover charging principles.
1.5 Interworking requirements
This is for further study.
1.6 Interaction with other supplementary services
1.6.1 Calling User Identification Presentation (CUIP)
Served users, who have subscribed to CUIP may receive the calling user's number if the calling user
has not subscribed/invoked Calling User Identification Restriction (CUIR).
1.6.2 Calling User Identification Restriction (CUIR)
Calling user: When CUIR is applicable and activated, the calling user identification will not bepresented to the forwarded-to user unless the forwarded-to user is in the override category. The latter
is a national option.

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1.6.3 Call forwarding
1.6.3.1 Call Forwarding Unconditional (CFU)
Not applicable.
1.6.3.2 Call Forwarding on PS Busy (CFB)
The invocation of CFU takes precedence over CFB.
1.6.3.3 Call Forwarding on No Reply (CFNRy)
The invocation of CFU takes precedence over CFNRy.
1.6.3.4 Call Forwarding on PS Not Reachable (CFNRc)
The invocation of CFU takes precedence over CFNRc.
1.6.4 Call barring
1.6.4.1 Barring of All Outgoing Calls (BAOC)
When CFU has been activated prior to the activation of Barring of All Outgoing Calls(BAOC), thecalls are forwarded regardless of the limitations of BAOC that has been activated; i.e. in this casethere exists no interaction between the two services.
After BAOC has been activated, calls can only be forwarded to destinations which are within thelimitations of BAOC, that has been activated.
1.6.4.2 Barring of Outgoing International Calls (BOIC)
Same as BAOC.
1.6.4.3 Barring of Outgoing International Calls except call to Home Country (BOIC-exHC)
Same as BAOC.
1.6.4.4 Barring of All Incoming Calls (BAIC)
When CFU has been activated prior to the activation of Barring of all incoming calls(BAIC), the calls
are forwarded regardless of BAIC that has been activated, i.e. in this case there exists no interaction
between the two services.
1.6.4.5 Barring of Incoming Calls on Roaming outside Home Country (BIC-roam)
When CFU has been activated prior to the activation of Barring of Incoming Calls on Roaming
outside Home Country (BIC-roam). the calls are forwarded regardless of BIC-roam that has been
activated, i.e. in this case there exists no interaction between the two services.

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After BIC-roam has been activated, calls can only be forwarded within the limitations of BIC-roam,that has been activated.
1.6.5 DTMF Transmission
No impact, i.e. neither supplementary service affects the operation of the other supplementary service(because these invocation criteria are mutually exclusive).
1.6.6 HandoverNo impact, i.e. neither supplementary service affects the operation of the other supplementary service(because these invocation criteria are mutually exclusive).
1.6.7 Subaddress
The sub-address associated with the original called party number shall not be forwarded if the call isforwarded.
1.6.8 User scrambling
No impact, i.e. neither supplementary service affects the operation of the other supplementary service(because these invocation criteria are mutually exclusive).

2 Call Forwarding on PS Busy
2.1 Definition
Call forwarding busy(CFB) permits a “served user”(see 2.2.2) to have the network send to anothernumber all incoming calls for the served user’s PHS number(or just those associate with a specified
basic service) which meet busy at the served user’s PHS number. The served user’s originating
service is unaffected.
The forwarded-to number is registered with the network for use on all calls.
2.2 Description
2.2.1 General Description
For a given PHS number, Call Forwarding Busy service (including options) may be subscribed to foreach basic service to which the user(s) of the number subscribes, or collectively for all the basic
services to which the user(s) subscribes.
The served user can request a different forwarded-to number for each basic service subscription
parameter value to which he has subscribed.
A notification that the CFB service is activated may, as an option, be given to the user who has

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forwarding activated, each time an outgoing call is made. This may take the form of a special
notification in the proceed response.
2.2.2 Specific terminology
Served user : User of a particular PHS number who is requesting that calls to his number be
forwarded. This user may also be referred to as the forwarding user or the called user.
Forwarded-to-user : User to whom the call shall be forwarded.
2.2.3 Qualifications on the applicability to telecommunication service
No restrictions identified.
2.3 Procedures
2.3.1

Provision/withdrawal

CFB shall be provided after pre-arrangement with the service provider.
The service can be offered with subscription options. Options apply separately to each basic service
subscribed to on each PHS number. For each subscription option, only one value can be selected.
Subscription options are summarized below:

Table 2-1/B-SV2.10 Subscription option values
Subscription options
Served user receives notificationthat the call has been forwarded

ValuesNo
Yes, with information about the callfor the NDUB case
Calling user receives notification No
that the call has been forwarded Yes, without the forwarded-to user
numberYes, with the forwarded-to user
numberServed user receives notification No
that CFB is currently activatedYes
Served user releases his/herNonumber to forwarded-to user
Yes
Note - Subscription options may be provided as a network provider options.

This service will be withdrawn by the service provider at the subscriber’s request or foradministrative reasons.

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2.3.2

Normal procedures

2.3.2.1 Activation/deactivation/registration
Same as CFU.
2.3.2.2 Invocation and operation
When CFB is active and the served user is network determined user busy (NDUB) or user determineduser busy (UDUB), then an incoming call to the served user will be forwarded.
In case of NDUB, the call is not offered to the served user. In this case, the served user, as a
subscription option, may receive notification of the call forwarding (but will not be able to answer theincoming call). This notification is given as soon as forwarding attempt is started.
In case of UDUB, the call will have been offered to the served user. Normal call set-up information
will already have been provided to the served user. When the forwarding attempt is started, the served
user, as a subscription option, may receive notification that a call has been forwarded. No further
notification is given.
The forwarded-to user may receive an indication that the call has been forwarded.
When multiple forwarding occurs, the reason for forwarding given to the forwarded-to user should
relate to the last forwarding user in the chain.
As a subscription option, the served user can request that the calling user receives a notification thatthe call has been forwarded (a notification may include the reason for forwarding and the forwardedto number).
Transfer of the forwarded-to user’s number to the calling user, may be subject to number notification
restrictions due to invocation of other supplementary services at the forwarded-to user.
2.3.3 Exceptional procedures
2.3.3.1 Activation/deactivation/registration
Same as CFU.
2.3.3.2 Invocation and operation
Call forwarding applies only to subscribed basic services. Calls to an PHS number requesting a basic
service which is not subscribed to, will never be forwarded.
In cases where a user may be given the address of users involved in the call (e.g. when the forwardedto user may receive the forwarding user’s address) as part of that user’s notification and this address
information is unavailable (e.g. due to address presentation restriction), the user who would have been
given the address shall get an indication on the reason why no number can given.
The total number of all forwarding for each call may be limited. This is to prevent infinite looping.
If the limit is reached and an attempt is made to forward the call an additional time, then theforwarded call shall be treated as follows:
If the forwarded call cannot be completed to the forwarded-to destination, then the network will clear
the forwarded leg of the call. Specifically, if CFB has been invoked, and CFNRy has not occurred,then the call would be cleared back towards the calling user, and the calling user would be sent a
cause to indicate that the call cannot be completed (i.e. because of network congestion, invalid
number, facility not available, etc.). This information shall not explicitly reveal that the call has been

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forwarded.
2.3.4 Alternative procedures
None identified

2.4 Network capabilities for charging
This specification does not cover charging principles.
2.5 Interworking requirements
Same as CFU.
2.6 Interaction with other supplementary services
The ways in which Call Forwarding on Busy interacts with other supplementary services are in
general identical to the ways in which Call Forwarding Unconditional interacts which othersupplementary services. Thus, if the interactions are described to be "same as CFU", the CFU text
should be taken verbatim, except that expression "Call Forwarding Unconditional" should be
replaced by " Call Forwarding on PS Busy".
2.6.1 Calling User Identification Presentation (CUIP)
Served users, who have subscribed to CUIP may receive the calling user's number if the calling user
has not subscribed/invoked Calling User Identification Restriction (CUIR).
2.6.2 Calling User Identification Restriction (CUIR)
Calling user: When CUIR is applicable and activated, the calling user identification will not bepresented to the forwarded-to user unless the forwarded-to user is in the override category. The latter
is a national option.
2.6.3 Call forwarding
2.6.3.1 Call Forwarding Unconditional (CFU)
The invocation of CFU takes precedence over CFB.
2.6.3.2 Call Forwarding on PS Busy (CFB)
Not applicable.
2.6.3.3 Call Forwarding on No Reply (CFNRy)
No impact, i.e. neither supplementary service affects the operation of the other supplementary service(because these invocation criteria are mutually exclusive).

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2.6.3.4 Call Forwarding on PS Not Reachable (CFNRc)
No impact, i.e. neither supplementary service affects the operation of the other supplementary service(because these invocation criteria are mutually exclusive).
2.6.4 Call barring
2.6.4.1 Barring of All Outgoing Calls (BAOC)
When CFU has been activated prior to the activation of Barring of All Outgoing Calls(BAOC), thecalls are forwarded regardless of the limitations of BAOC that has been activated; i.e. in this casethere exists no interaction between the two services.
After BAOC has been activated, calls can only be forwarded to destinations which are within thelimitations of BAOC, that has been activated.
2.6.4.2 Barring of Outgoing International Calls (BOIC)
Same as BAOC.
2.6.4.3 Barring of Outgoing International Calls except call to Home Country (BOIC-exHC)
Same as BAOC.
2.6.4.4 Barring of All Incoming Calls (BAIC)
When CFU has been activated prior to the activation of Barring of All Incoming Calls(BAIC), thecalls are forwarded regardless of the limitations of BAIC that has been activated; i.e. in this casethere exists no interaction between the two services.
2.6.4.5 Barring of Incoming Calls on Roaming outside Home Country (BIC-roam)
When CFU has been activated prior to the activation of Barring of Incoming Calls on Roaming
outside Home Country (BIC-roam) . the calls are forwarded regardless of the limitations of BIC-roamthat has been activated; i.e. in this case there exists no interaction between the two services.
After BIC-roam has been activated, calls can only be forwarded within the limitations of BIC-roam,that has been activated.
2.6.5 DTMF Transmission
No impact, i.e. neither supplementary service affects the operationof the other supplementary service (because these invocation criteria aremutually exclusive).
2.6.6 HandoverNo impact, i.e. neither supplementary service affects the operation of the other supplementary service

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(because these invocation criteria are mutually exclusive).
2.6.7 Subaddress
The sub-address associated with the original called party number shall not be forwarded if the call isforwarded.
2.6.8 User scrambling
No impact, i.e. neither supplementary service affects the operation of the other supplementary service(because these invocation criteria are mutually exclusive).
3 Call forwarding on No Reply
3.1 Definition
Call Forwarding on No Reply permits a “served user” to have the network send to another number all
incoming calls for the served user’s PHS number which meet no reply, or just those associated with a
specified basic service which meet no reply. The served user’s originating service is unaffected.
The forwarded-to number is registered with the network for use on all calls.
3.2 Description
3.2.1 General description
For a given PHS number, the Call Forwarding on No Reply (CFNRy) service (including options), may
be subscribed to for each basic service to which the user(s) of the number subscribes, or collectively
for all the basic services to which the user(s) subscribes.
The served user can request a different forward-to number for each basic service subscription
parameter value to which he has subscribed.
An notification that the CFNRy service is activated on a number may, as an option, be given to theuser who has forwarding activated, each time an outgoing call is mode. This may take the form ofspecial notification in the proceed response.
3.2.2 Specific terminology
Served user: User of a particular PHS number who is requesting that calls to his number be
forwarded. This user may also be referred to as the forwarding user or the called user.
Forwarded-to-user: User to whom the call shall be forwarded.
3.2.3 Qualifications on the applicability to telecommunications services
No restrictions identified.

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3.3 Procedures
3.3.1 Provision/withdrawal
CFNRy shall be provided after pre-arrangement with the service provider.
The service can be offered with subscription options. Options apply separately to each basic service
subscribed to on each PHS number. For each subscription option, only one value can be selected.
Subscription options are summarized below:

Table 3-1/B-SV2.10 Subscription option values
Subscription options
ValuesServed user receives notification that the No
call has been forwarded
Yes
Calling user receives notification that the No
Yes, without the forwarded-to user
call has been forwarded
number(See Note)Yes, with the forwarded-to user
numberNo reply condition timer
e.g. 5-60 seconds, in steps of 5
secondServed user receives notification thatNo
CFNRy is currently activatedYes
Served user releases his/her number to No
forward-to user
Yes
Note- Subscription option may be provided as a network provider option.

This service will be withdrawn by the service provider at the subscriber’s request or foradministrative reasons.
3.3.2 Normal procedures
3.3.2.1 Activation/deactivation/registration
Same as CFU.
3.3.2.2 Invocation and operation
When CFNRy is active, incoming calls will be offered to the served user. Normal call offering
information is provided to the served user. If the served user does not reply within a subscribed timeinterval, the call will be forwarded. The served user, as a subscription option, may receive notificationthat a call has been forwarded.
The forwarded-to user may receive an indication that the call has been forwarded.
If multiple forwarding have occurred, The forwarding cause that the forwarded-to user received
includes last forwarding served user information.

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The forwarding of the forwarded-to number to the originating user may be limited under activation ofother supplementary services that the forwarded-to user have subscribed.
3.3.3 Exceptional procedures
3.3.3.1 Activation/deactivation/registration
Same as CFU.
3.3.3.2 Invocation and operation
Call forwarding applies only to subscribed basic services. Calls to an PHS number requesting a basic
service which is not subscribed to will never be forwarded.
In cases where a user may be given the address of users involved in the call[e.g. when the forwardedto user may receive the forwarding user’s addresses] as part of that user’s notification and this address
information is unavailable (e.g. due to address presentation restriction), the user who would have been
given the address shall get an indication on the reason why no number can be give.
The total number of all forwardings for each call may be limited. This is to prevent infinite looping.
If the limit is reached and an attempt is made to forward the call an additional time, then theforwarded call shall be treated as follows:
If the forwarded call cannot be completed to the forwarded-to destination, then as a service provider
option the network may either:(1) Clear the forwarded leg of the call and continue to alert the served user. The calling user will, inthe case of a telephony call, continue to receive in-band ringing tone. The “no reply” timer need not
be restarted. However, as a network option, the “no reply” timer may be restarted at this point. (Notethat, with this option, during the invocation of CFNRy the forwarding user shall continue to be alerted
until alerting commences at the forwarded-to user).
(2) Clear the call back towards the calling user and the calling user would be sent a cause to indicatethat the call cannot be completed(i.e. because of network congestion, invalid number, facility notavailable, etc.). This information shall not explicitly reveal that the call has been forwarded. If
CFNRy has previously occurred, then the call would be cleared back towards that served user; (Notethat, with this option, the alerting of the forwarding user shall have ceased on invocation of CFNRy.)
3.3.4 Alternative procedures
None identified.
3.4 Network capabilities for charging
This Specification does not cover charging principles.

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3.5 Interworking requirements
Further study.
3.6. Interaction with other supplementary services
3.6.1 Calling User Identification Presentation (CUIP)
Same as CFU.
3.6.2 Calling User Identification Restriction (CUIR)
Same as CFU.
3.6.3 Call forwarding
3.6.3.1 Call Forwarding Unconditional (CFU)
The invocation of CFU takes precedence over CFNRy.
3.6.3.2 Call Forwarding on PS Busy (CFB)
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
Because these invocation criteria are mutually exclusive.
3.6.3.3 Call Forwarding on No Reply (CFNRy)
Not applicable.
3.6.3.4 Call Forwarding on PS Not Reachable (CFNRc)
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
Because these invocation criteria are mutually exclusive.
3.6.4 Call barring
3.6.4.1 Barring of All Outgoing Calls (BAOC)
When CFNRy has been activated prior to the activation of BAOC, the calls are forwarded regardlessof the limitations of the version of BAOC that has been activated; i.e. in this case there exists nointeraction between the two services.
After BAOC has been activated, calls can only be forwarded to destinations which are within thelimitations of the BAOC version, that has been activated.
3.6.4.2 Barring of Outgoing International Calls (BOIC)
Same as BAOC.

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3.6.4.3 Barring of Outgoing International Calls except call to Home Country (BOIC-exHC)
Same as BAOC.
3.6.4.4 Barring of All Incoming Calls (BAIC)
Same as CFU.
3.6.4.5 Barring of Incoming Calls on Roaming outside Home Country (BIC-roam)Same as CFU.
3.6.5 DTMF Transmission
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
Because these invocation criteria are mutually exclusive.
3.6.6 HandoverNo impact, i.e. neither supplementary service affects the operation of the other supplementary service.
Because these invocation criteria are mutually exclusive.
3.6.7 Subaddress
Same as CFU.
3.6.8 User scrambling
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
Because these invocation criteria are mutually exclusive.

4 Call Forwarding on PS Not Reachable (CFNRc)
4.1 Definition
Call forwarding on PS not reachable (including in case of turning off the PSs power) permits a“served user” (see 4.2.2 to have the network send to another number all incoming calls for the served
user's PHS number or just those associated with a specified basic service which meet on PS notreachable. The served user's originating service is unaffected.
The forwarded-to number is registered with the network for use on all calls.
4.2 Description
4.2.1 General Description
For a given PHS number, this service (including options) may be subscribed to for each basic service
to which the user(s) of the number subscribes, or collectively for all the basic services to which the

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user(s) subscribes.
The served user can request a different forwarded-to number for each basic service subscription
parameter value to which he has subscribed.
A notification that the CFNRc service is activated may, as an option, be given to the user who has
forwarding activated, each time an outgoing call is made.
This may take the form of a special notification in the proceed response.
4.2.2 Specific terminology
Served user: User of a particular PHS number who is requesting that calls to his number be
forwarded. This user may also be referred to as the forwarding user or the called user.
Forwarded-to-user: User to whom the call shall be forwarded.
4.2.3 Qualifications on the applicability to telecommunication services
No restrictions identified.
4.3 Procedures
4.3. I Provision/withdrawal
CFNRc shall be provided after pre-arrangement with the service provider.
The service can be offered with subscription options. Options apply separately to each basic service
subscribed to on each PHS number. For each subscription option, only one value can be selected.
Subscription options are summarized below:

Table 4-1/B-SV2.10 Subscription option values
Subscription options
Calling user receives notification thatthe call has been forwarded

ValuesNo
Yes, without the forwarded-to user
numberYes, with the forwarded-to user number
Served user receives notification that No
CFNRc is currently activatedYes
Served user releases his/her number to No
forwarded-to user
Yes
Note - Subscription options may be provided as a network provider options.

This service will be withdrawn by the service provider at the subscriber's request or for administrative
reasons.
4.3.2 Normal procedures
4.3.2.1 Activation/deactivation/registration

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Same as CFU.
4.3.2.2 Invocation and operation
When CFNRc is active, all incoming calls which meet on PS not reachable (network determine) will
be forwarded.
The forwarded-to user may receive an indication that the call has been forwarded.
When multiple forwarding occurs, the reason for forwarding give to the forwarded-to user should tothe last forwarding user in the chain.
As a subscription option, transfer of the forwarded-to user’s number to the calling user, may besubject to number notification restrictions due to invocation of other supplementary services at theforwarded-to user.
4.3.3 Exceptional procedure
4.3.3.1 Activation/deactivation/registration
4.3.3.1.1 Activation
Call Forwarding on PS Not Reachable for all basic services and Call Forwarding of particular basic
services cannot be activated simultaneously. If the PHS network cannot accept an activation request,
the served user should receive a notification that call forwarding activation was unsuccessful. The
following are possible causes as an example, so the application is a network option.
(1) service not subscribed;(2) forwarded-to number invalid;(3) forwarded-to number's telecommunication services violate subscribed constraints (e.g. group
restrictions);(4) insufficient information;(5) requested telecommunication service is not provided to the forwarded-to number:(6) forwarded-to number is a special service code (e.g. police);(7) forwarded-to number is served user's number.
However, the network is not required to validate information related to the forwarded-to user.
4.3.3.1.2 Deactivation
Same as CFU.
4.3.3.2 Invocation and operation
Call forwarding applies only to subscribed basic service. Calls to a PHS number requesting a basic
services which is not subscribed to, will never be forwarded.
In cases where a user may be given the address of users involved in the call [e.g. when the forwardedto user may receive the forwarding user's address) as part of that user's notification and this address
information is unavailable (e.g. due to address presentation restriction), the user who would have been
given the address shall get an indication on the reason why no number can be given.

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The total number of all forwarding for each call may be limited. This is to prevent infinite looping.
If the limit is reached and an attempt is made to forward the call an additional time, then theforwarded call shall be treated as follows:
If the forwarded call cannot be completed to the forwarded-to destination, then the network will clear
the forwarded leg of the call. If the call has not previously undergone CFNRy, the call will be cleared
all the way back to the calling user.
4.3.4 Alternative procedures
None identified.
4.4 Network capabilities for charging
This Specification does not cover charging principles.
4.5 Interworking requirements
This is for further study.
4.6 Interaction with other supplementary services
The ways in which CFNRc interacts with other supplementary services are in general identical to theways in which Call Forwarding Unconditional interacts which other supplementary services. Thus, if
the interactions are described to be “same as CFU”, the CFU text should be taken verbatim, exceptthat “Call Forwarding Unconditional” should be replaced by “CFNRc”.
4.6.1 Calling User Identification Presentation (CUIP)
A forwarded-to user who subscribes to CUIP may receive the calling user’s number if the calling user
has not subscribed/invoked Calling Use Identification Restriction (CFIR).
4.6.2 Calling User Identification Restriction (CUIR)
Same as CFU.
4.6.3 Call forwarding
4.6.3.1 Call Forwarding Unconditional (CFU)
The invocation of CFU takes precedence over CFNRc.
4.6.3.2 Call Forwarding on PS Busy (CFB)
No impact, i.e. neither supplementary service affects the operation of the other supplementary service(because these invocation criteria are mutually exclusive).

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4.6.3.3 Call Forwarding on No Reply (CFNRy)
No impact, i.e. neither supplementary service affects the operation of the other supplementary service(because these invocation criteria are mutually exclusive).
4.6.3.4 Call Forwarding on PS Not Reachable (CFNRc)
Not applicable.
4.6.4 Call barring
4.6.4.1 Barring of All Outgoing Calls (BAOC)
Same as CFU.
4.6.4.2 Barring of Outgoing International Call (BOIC)
Same as CFU.
4.6.4.3 Barring of Outgoing International Calls except call to Home Country (BOIC-exHC)
Same as CFU.
4.6.4.4 Barring of All Incoming Calls (BAIC)
Same as CFU.
4.6.4.5 Barring of Incoming Calls on Roaming outside Home Country (BIC-roam)Same as CFU.
4.6.5 DTMF Transmission
Same as CFU.
4.6.6 HandoverSame as CFU.
4.6.7 Subaddress
Same as CFU.
4.6.8 User scramblingSame as CFU.

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