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0.2Interworking at the I-IWU




      1. Call forwarding within the ISUP Network.




Message sent to SIP

Message Received from BICC/ISUP

INVITE

IAM

181

ACM indicating call forwarding

180

ACM indicating ringing

181

CPG indicating call forwarding

180

CPG indicating ringing

200 OK

ANM

200 OK

CON








Figure 4: Call Forwarding Busy

In case of a call forwarding a ACM with a Optional backward call indicator indicating that call diversion may occur and a Generic notification Call is diverting a 181 shall be send in backward direction.



Table 5: ACM  181 Forwarding


ACM




181




Optional backward call indicators

Bit B

call diversion may occur







Generic notification indicators

Call is diverting




Based on the ISUP Parameter the 181 message is created

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 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



Redirection number restriction indicator

presentation restricted

Priv-value

“user”

“header”



presentation restricted




proposed Values for History

“History-Index”

“History-header”


Presentation allowed or absent




Privacy header field absent

or

“none”



Call diversion information

Notification subscription options

presentation not allowed



Priv-value

“header”


presentation allowed without redirection number




proposed Values for History

“History-Index” or “History-header”

and

Privacy header field absent or “none”



presentation allowed with redirection number




Privacy header field absent or “none”

Call diversion 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

















A received CPG shall be mapped t a 180 if the CPC indicates a Alerting is due to the mapping ruled defined within the basic call.


Table 6: Mapping of CPG  181


CPG




181




Optional backward call indicators


call diversion may occur









Event Indicator

CFB(national use)

CFNR(national use)

CFU(national use)





Not relevant ?

Generic notification Indicator

Call is a diverting Call




Based on this Information the CPG shall be mapped to a 181

Redirection number

See Table 5

History Header

See Table 5

Call Diversion Information

See Table 5

History Header

See Table 5

Redirection number restriction indicator

See Table 5

Priv-value

See Table 5



Table 7: (CFB) Mapping of ANM/CON  200OK



ANM




200




Redirection number

See Table 5


History Header

See Table 5

Redirection number restriction indicator

See Table 5

Priv-value

See Table 5

Figure 5: Call Forwarding Non Reply




Figure 6: Call Forwarding Unconditional


      1. Call forwarding within the SIP Network.




Figure 8 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.




INVITE




IAM




History Header

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


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

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 set to

NDC + SN.

If NOA is “international number”

then set to CC+NDC+SN


Privacy Header

Priv-value

Redirecting number

APRI

proposed Values for History

“History-Index” or “History-header”



“presentation restricted”

Privacy header field absent or “none”

“presentation allowed”

Privacy Header

&

Index History > 1 or 1.1



Priv-value

Redirecting Information

Redirection indicator

“none”

Call diverted (based on Invormation given in the history-Index header this parameter is set)




proposed Values for History

“History-header” or

“header” (if P-Asserted-ID is “id”)


Call diverted, all redirection info presentation restricted

History Index

Index number for Redirecting number

Redirecting Information

Redirection counter = Value Index number for Redirecting number
If Value >5 then release Call


History Index

Reason Header: Reason = “Q.732

Redirecting Information

Redirecting Reason

User busy

Unknown/not available

no reply

User busy

unconditional

No reply

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


To header and
first Index entry of History Header

Redirecting number

cause=XXX ;text="XXX”>


;index=1,


Original Called Party Number

See Redirecting number


Privacy Header

Priv-value

Original Called Party Number

APRI




proposed Values for History

“History-Index” or “History-header”



Note: depended on the privacy statement for the redirecting number

“presentation restricted”




Privacy header field absent or “none”

“presentation allowed”


1ANNEX


This list is a draft list.


SUPPL Service

Party

ISUP-SIP

SIP-ISUP

SIP-SIP

Service definition in SIP

ISUP Parameter

DSS1 Parameter

CFB

B(A)

No

No

Yes

http://www.ietf.org/internet-drafts/draft-ietf-sipping-service-examples-04.txt

1) Optional backward call indicators
2) Generic notification indicators
3) Redirection number
4) Redirection number restriction indicator
5) Call diversion information
6) Event indicator
7) Original called number
8) Redirection information;


Facility Nachricht
Notification indicator information element
Redirecting number information element


CFNR

B(A)

No

No

Yes




1) Optional backward call indicators
2) Generic notification indicators
3) Redirection number
4) Redirection number restriction indicator
5) Call diversion information
6) Event indicator
7) Original called number
8) Redirection information;


Facility Nachricht
Notification indicator information element
Redirecting number information element


CFU

B(A)

No

No

Yes

http://www.ietf.org/internet-drafts/draft-ietf-sipping-service-examples-04.txt

1) Optional backward call indicators
2) Generic notification indicators
3) Redirection number
4) Redirection number restriction indicator
5) Call diversion information
6) Event indicator
7) Original called number
8) Redirection information;


Facility Nachricht
Notification indicator information element
Redirecting number information element





Attention: This is not an Deutsche Telekom (T332) publication made available to the public, but an internal Deutsche Telekom Document (T332) intended only for use by the companies and their respective staff and collaborators involved in their work related to above mentioned issue It shall not be made available to, and used by, any other persons or entities without the prior written consent of Deutsche Telekom (T332).

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