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0.1Interworking at the O-IWU



      1. Call forwarding within the SIP Network.



Figure 1 Call Forwarding Busy

For the mapping of IAM to the INVITE Message no additional procedures beyond the basic call procedures are needed.


With regard to the Backward Messages the following mapping is valid:


Message sent to ISUP

Message Received from SIP

ACM indicating call forwarding

181

CPG indicating Cal Diversion

181

ACM indicating ringing

180

CPG indicating Alerting

180

ANM

200 OK

CON

200 OK

Table 1 : Mapping of 181 Forwarding  ACM


181




ACM










Optional backward call indicators

Bit B

call diversion may occur







Generic notification indicators

Call is diverting

History Header

cause=486 ;text="Busy >;index=2.1,


appropriate global number portion of the URI, assumed to be in form
"+" CC+NDC+SN

Redirection number

Nature of address indicator:

If CC is equal to the country code of the country where I-IWU is located AND the next BICC/ISUP node is located in the same country then set to “national (significant) number”

else set to “international number
Address Signals

If NOA is “national (significant) number” then set to

NDC + SN.

If NOA is “international number”

then set to CC+NDC+SN


Priv-value

“user”

“header”



Redirection number restriction indicator

presentation restricted

proposed Values for History

“History-Index”

“History-header”


presentation restricted

Privacy header field absent

or

“none”



Presentation allowed or absent

Priv-value

“header”


Call diversion information Notification subscription options

presentation not allowed



proposed Values for History

“History-Index” or “History-header”

and

Privacy header field absent or “none”



presentation allowed without redirection number

Privacy header field absent or “none”

presentation allowed with redirection number

History Index

Reason Header: Reason = “Q.732

Call diversion information

Redirecting Reason

Unknown/not available

User busy

User busy

no reply

No reply

unconditional

Unconditional

Unconditional

Deflection during alerting

Deflection during alerting

Deflection immediate response

Deflection immediate response

Mobile subscriber not reachable

Mobile subscriber not reachable

Reason Header: Reason = “Q.850”




SIP Reason 486  Busy Here

User busy

SIP Reason 487  Call terminated

no reply

???


unconditional



















180 Ringing  ACM or CPG



Table 2 : Mapping of 181 Forwarding  CPG if ACM was already sent


180




CPG










Optional backward call indicators


call diversion may occur









Generic notification indicators

Call is diverting

History-header

cause=486 ;text="Busy here” >;index=2.1,

Cause 486 in History Index


Event indicator

PROGRESS

Or


Based on the Index entry

CFB(national use)

CFNR(national use)

CFU(national use)


Note [RJ]: I think Alerting is the correct one

History Header

See Table 1


Redirection number

See Table 1

Priv-value

See Table 1



Redirection number restriction indicator

See Table 1


Priv-value

See Table 1

Call diversion information Notification subscription options

See Table 1

Reason Header

Reason = “Q.732”

Or

History Index



See Table 1

Call diversion information Redirecting Reason

See Table 1














Table 3 : Mapping of 180  ACM if no 181 was received before


180




ACM




History Header

If Index indicate that there is a call forwarding.

More than two index entries with two digits Index X.X



Optional backward call indicators

Bit B

no indication

call diversion may occur

History Header

If Index indicate that there is a call forwarding.

More than two index entries with two digits Index X.X



Generic notification indicators

Call is diverting

History Header

See Table 1

Redirection number

See Table 1


Priv-value

See Table 1



Redirection number restriction indicator

See Table 1


Priv-value

See Table 1

Call diversion information Notification subscription options

See Table 1

Reason Header

Reason = “Q.732”

Or

History Index



See Table 1

Call diversion information Redirecting Reason

See Table 1












The IWU can indicate the call diversion in the mapping of 180 to CPG in fact if the response before was a 181.


Table 4 : (CFB) Mapping of 180  CPG if a 181 was received before



180




CPG










Optional backward call indicators


call diversion may occur









Generic notification indicators

Call is diverting

History-header

cause=486 ;text="Busy here” >;index=2.1,

Cause 486 in History Index


Event indicator

ALERTING


Note [RJ]: I think Alerting is the correct one

History Header

See Table 1


Redirection number

See Table 1

Priv-value

See Table 1



Redirection number restriction indicator

See Table 1


Priv-value

See Table 1

Call diversion information Notification subscription options

See Table 1

Reason Header

Reason = “Q.732”

Or

History Index



See Table 1

Call diversion information Redirecting Reason

See Table 1














Table 5 : (CFB) Mapping of 200OK


200 OK




ANM




History Header

See Table 1


Redirection number

See Table 1

Priv-value

See Table 1



Redirection number restriction indicator

See Table 1
















Figure 2 Call Forwarding Non Reply



Figure 3 Call Forwarding Unconditional

(Note 1) It is implementation dependent if the 181 will be send from a Proxy.



      1. Call forwarding within the ISUP Network.

The following Scenario shows if a Call Forwarding appears in the ISUP/PSTN Network and the redirected Number is within the SIP Network. The following Figure should be seen as example.



Figure 3: Call Forwarding in the ISUP Network with diverted Number in SIP Network



Figure 4 Call Forwarding Busy in a ISUP network to a SIP User Agent

For the mapping of 180 and 200 OK to the regarding ISUP messages and parameters no additional procedures beyond the basic call procedures are needed.




IAM




INVITE




Redirecting number

Nature of address indicator:

If CC is equal to the country code of the country where I-IWU is located AND the next BICC/ISUP node is located in the same country then set to “national (significant) number”

else set to “international number

Address Signals

if NOA is “national (significant) number” then the format of the address signals is:

NDC + SN

If NOA is “international number”

then the format of the address signals is:

CC + NDC + SN




History Header

cause=486 ;text="Busy >;index=2.1,

Add CC (of the country where the IWU is located) to Generic Number Address Signals then map to user portion of URI scheme used.

Map complete Redirection number Address Signals to user portion of URI scheme used.



display-name may be mapped from Address Signals, if possible and network policy allows it

Addr-spec

"+” CC NDC SN mapped to user portion of URI scheme used



Redirecting number

APRI

Privacy Header

Priv-value

“presentation restricted”

proposed Values for History

“History-Index” or “History-header”



“presentation allowed”

Privacy header field absent or “none”

Redirecting Information

Redirection indicator

Privacy Header

Priv-value

Call diverted

“none”

Call diverted, all redirection info presentation restricted

proposed Values for History

“History-header” or

“header” (if P-Asserted-ID is “id”)


Redirecting Information

Redirection counter

1 …5


History Index

Index number for Redirecting number = value of redirecting counter

Redirecting Information

Redirecting Reason

History Index

Reason Header: Reason = “Q.732

Unknown/not available

User busy

User busy

no reply

No reply

unconditional

Unconditional

Unconditional

Deflection during alerting

Deflection during alerting

Deflection immediate response

Deflection immediate response

Mobile subscriber not reachable

Mobile subscriber not reachable




Reason Header: Reason = “Q.850”

User busy

SIP Reason 486  Busy Here

no reply

SIP Reason 487  Call terminated

unconditional





Original Called Party Number

See Redirecting number


To header and
first Index entry of History Header

Redirecting number

cause=XXX ;text="XXX”>


;index=1,


Original Called Party Number

APRI

Privacy Header

Priv-value

“presentation restricted”

proposed Values for History

“History-Index” or “History-header”



Note: depended on the privacy statement for the redirecting number

“presentation allowed”

Privacy header field absent or “none”

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