SIP P-Early-Media and SS7 UID Parameters Interworking

Owned by Kelli Higdon
Last updated: Apr 02, 2024
2 min read

 

3GPP TS 29.163 is the latest of the interworking standards between ISUP and SIP. It is closely aligned with ITU-T Q.1912.5, but also supports some additional interworking use cases and supplementary services. On the SIP side, conventions of IMS SIP are often used.

This feature will add the interworking of the SIP P-Early-Media versus the SS7 UID parameters (capability/action indicators).

Call Flow Diagrams

The call flows displayed below are the supported call flows interworking of the SIP P-Early-Media versus the SS7 UID parameters (capability/action indicators).

SIP to SS7 call

 

Description

  • INVITE P-Early-Media with "supported" is interworked to SS7 IAM UID capability indicator parameter.

  • SS7 ACM UID Action indicator parameter is interworked to SIP 183 with P-Early-Media "sendrecv".

 

 

Description

  • INVITE P-Early-Media with "supported" is interworked to SS7 IAM UID capability indicator parameter.

  • SS7 CPG UID Action indicator parameter is interworked to SIP 183 with P-Early-Media "sendrecv".

 

SS7 to SIP call

 

Description

  • 183 with SDP and P-Early-Media set to backward authorized will be interworked as CPG (In band available).

  • Note that ACM has been sent.

 

Configuration

SIP configuration is done in SIP Profile - Headers:

  • Set the P-Early-Media Support to "Relay".
     

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