IMG 1010 - SIP Diversion Header

Overview

The IMG supports the INVITE Diversion Header (Diversion and CC-Diversion) to support PSTN Redirecting Services (also known as Call Forwarding). The INVITE Diversion header carries information about the redirection of a call. The Diversion header prevents the pertinent SS7 or ISDN redirection information from being lost in the SS7/ISDN to SIP conversion. When SS7 redirection information is received on the incoming side, it is relayed in the Diversion header on the outgoing SIP side. The Call Flows below describe the functionality that is supported when utilizing the SIP Diversion Header. To enable or disable SIP Diversion Header refer to the IMG 1010 - SIP Headers topic.

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1. The Redirecting number will always be interworked to the SIP side as the topmost Diversion Header.

2. The Original Called number will always be interworked to the SIP side as the bottommost Diversion Header.
   

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SS7 to SIP with NOA Scenario (10.5.3 SP9)

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1. The number in the SIP Diversion Header is interworked to both the Redirecting Number and the Original Called Number.

2. If the Original Called Number is not needed on the SS7 side, it can be filtered by setting the Original Called Number field in the IMG 1010 - SS7 Parameter Filter object to Don't Pass.

3. If the Redirecting Number is not needed on the SS7 side, it can be filtered by setting the Redirecting Number field in the IMG 1010 - SS7 Parameter Filter object to Don't Pass.
   

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SIP to SS7 with NOA Scenario (10.5.3 SP4.1)

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1. The Nature of Address parameter in the topmost Diversion Header received is mapped to the Redirecting Number on the SS7 side.

2. The Nature of Address parameter in the bottommost Diversion Header received is mapped to the Original Called Number on the SS7 side.

3. If the SIP INVITE message received has a Diversion Header without a Nature Of Address parameter then a Default value of NOA=3 will be added to the outgoing ISUP messaging.

4. If the Original Called Number is not needed on the SS7 side, it can be filtered by setting the Original Called Number field in the IMG 1010 - SS7 Parameter Filter object to Don't Pass.

5.  If the Redirecting Number is not needed on the SS7 side, it can be filtered by setting the Redirecting Number field in the IMG 1010 - SS7 Parameter Filter object to Don't Pass.
   

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ISDN to SIP Call Forwarding Scenario

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1. The 1st Redirecting Number received in the ISDN SETUP message will be interworked into the topmost Diversion header on the SIP side.

2. The 2nd Redirecting Number received in the ISDN SETUP message will be interworked into the bottommost Diversion header on the SIP side.
   

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Related Topics:

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